The 12 Days of Evolution – Complete Series!


[MUSIC] [BIRD CHIRP] A smart person once said “nothing in biology
makes sense except in the light of evolution.” Evolution is what lets us understand the history
of life. We’re used to seeing things change over
time. But biological evolution is about something
more. Centuries of observing nature has shown us that all life is related.
And just like how the physics here on Earth is the same physics that rules the Andromeda
galaxy, the same basic biological rules apply to all creatures great and small. If life has a point, it’s making more life. The instructions parents give to the next
generation come with a few random changes. Every new generation ends up slightly different
than the generation before it. But nature doesn’t always make survival
easy, so any creature that lives long enough to make more life passes its traits on more
often. This is what Darwin and Wallace figured out,
the beautiful theory we still study today. That all life is descended
from a common ancestor, that new generations show variation, and the more often a trait
survives, the mores common it will become. It might not tell us how life began, but it
tells us how all living things came to be the way they are, bacteria, bugs, or Beagles. [BIRD CHIRP] Some people think nature is like a tornado
that picks up a pile of raw materials and then spits out a palace. But nature doesn’t work that way. Copying DNA, UV rays, chemicals, the shuffling
of genes, they all introduce tiny changes, and those changes are random. But natural
selection is anything but random. An organism builds its house using DNA blueprints.
But when it copies those blueprints, they’re a little different thanks to that random genetic
variation. When construction begins… Some of the houses that get built fall down.
Some of the houses aren’t better or worse… just different.
But some of the houses turn out even better! The blueprints for the houses that stay standing get put back into the genetic shuffling machine so nature can do it all again. And again and
again and again. Nature doesn’t set out to build one perfect
house. It’s constructed billions of houses, with trillions of blueprints, and a lot of
nature’s houses fell down along the way. Life isn’t just chance. It’s the non-random
selection of random variation, and it built this beautiful city called Life. [BIRD CHIRP] Male crickets love to sing. But on the Hawaiian
island of Kauai, that singing comes with a price. Several years ago, a parasitic fly arrived
on the island. Those flies listen for crickets’ chirping wings, lay eggs inside them, and
the crickets are devoured from within. Thanks to these flies, Kauai’s crickets
almost disappeared, except for a few. These survivors were missing the ridges that
crickets normally rub together to chirp, and today Kauai is filled with quiet crickets. Silence saved their lives.
This wasn’t just a change in behavior. The silent wing shape was caused by a mutation
on the cricket’s X chromosome. Kauai’s crickets became the strong silent
type in fewer than 20 generations. Not only did we see natural selection in action, it
happened in the blink of an eye. A few years later, those parasitic flies showed
up on neighboring Oahu, and in response, most of the crickets there had gone silent too.
Surprisingly, they had developed a completely different mutation in the same gene.
Nature arrived at the same destination by two completely different paths. While evolution is often a long gradual process,
rest assured we’ve witnessed plenty of fine tune-ing right before our eyes. [BIRD CHIRP] Your eyes are beautiful. They’re amazing
bits of biological engineering. Just like a camera, remove one of their intricate parts,
and the eye can’t do its job. For this reason, many people think eyes couldn’t
possibly arise from a blind process like natural selection. But that idea doesn’t hold vitreous
fluid. Light-sensitive cells first showed up in simple
single-celled creatures, helping them swim towards the sun.
Cup-shaped light spots then began to let creatures sense light’s direction.
Deeper pits eventually formed a pinhole iris, increasing the eye’s resolution.
Some animals developed a protective, crystalline covering over the iris, which later allowed
them to focus and control the light entering their eye.
This is essentially the eye that we have today. Computer simulations have replayed this selective
process in just 350,000 generations, showing simple light patches can evolve into camera-like
eyes in tiny, adaptive steps, 1,829 to be precise.
Nature took a little longer than that, but genes, biochemistry, fossils, and anatomy
all tell the same story. Eyes are pretty easy to evolve. So easy that nature has done it
independently 50 to 100 times. This kind of complexity, rather than overthrowing
Darwin’s theory, is proof of its power. So whether it’s an eagle observing ants
from atop a skyscraper, a mantis shrimp scanning circularly polarized light, or you watching
YouTube videos… there’s room for an eye… in evolution. [BIRD CHIRP] During WWII, Londoners took nightly refuge
in the Underground as German buzz bombs exploded above. But they were greeted with a different
buzz: Mosquitoes. In the 19th century, when London’s Tube
was being dug, a population of mosquitoes colonized the tunnels. They originally preferred
biting birds above ground, but since pigeons don’t ride the subway, they found a new target in rats,
mice and people. Now, just more than a century later, when
the tube-dwellers try to mate with their above-ground cousins, it almost never results in viable
offspring. The subway skeeters are becoming a new species right before our eyes, with
different behaviors, and different genes. Species are always more likely to emerge when
a population gets isolated. Maybe one goes underground. Maybe a river
runs through them. Or maybe one drifts out to sea. Once separated, a different drift occurs:
genetic drift. As time goes on, mutations accumulate and traits are selected by each environment,
until the two groups are sufficiently different that they can’t mate. Or, as scientists call it, reproductive isolation. London’s mosquitoes didn’t invent this.
It happened with the dozen or more tortoise species that Darwin found in the Galápagos. It
created us and our extinct Neanderthal cousins. Small, random changes, challenged by nature,
have spawned each of the tens of millions of species alive today, and the hundreds of
millions that are stuck… underground. [BIRD CHIRP] A giraffe looks perfectly suited for its environment.
But that long neck hides a stunning error of evolutionary engineering. Although it’s just a few inches from the
brain, the nerves controlling a giraffe’s voice box take a 15-foot detour before reaching
their destination. We’re wired up the same way. The nerve letting
me to talk to you right now is wrapped around my aorta.
In our fish ancestors, that nerve connected brain to gills. But as gills gave way to lungs
and heads moved forward, things got a little tangled. Our bodies are full of examples proving
evolution can be kind of dumb. Why else would the waste management system
be built by the amusement park? Why else would we eat, drink, and breathe
all through the same hole? Why do we get cavities, or cancer?
Why else would I be wearing these?! Because natural selection isn’t about “survival
of the fittest”, it’s more like survival of the “good enough’. Nature can’t draw up a body from scratch,
it can only tweak existing plans. And if a plan works well enough to allow an organism
to reproduce, it gets passed on, tangled wiring and all. Life may not be logical, but you know I’m
speaking from the heart when I say, “Congratulations on being good enough.” [BIRD CHIRP] Look down. No matter what your biological
sex, I’m willing to bet most of you have two nipples. If you can’t see them, they’re
probably under your shirt. Some people have even more than two! But that’s
for another video. It’s easy to see why females have two nipples.
We’re mammals. It’s right there in the name. Dogs, cats, pigs and whales all have
nipples too. Like us, they nourish their offspring with milk. Male nipples? Not much going on there. If they’re not an evolutionary advantage,
why hasn’t natural selection erased ‘em? Because my nipples are cheap, and they’re
not hurting anything. In the eyes of evolution, male nipples don’t
have much cost: Just a little more tissue. But deleting them from the recipe altogether,
reprogramming the genes and body development in just in one sex? That would cost more. Traits don’t have to provide a specific
advantage to get passed on. Why is your blood red and an octopus’s is
blue? It’s not because one color’s better, it’s just a side effect of nature selecting
different chemistry for different creatures. And sometimes, traits can end up being used
for a function different from what nature originally selected. Not every trait is an adaptation, and they
don’t all have a point. Sometimes they have two. [bird chirp] There’s only a few unbreakable laws in the
universe. One says that disorder always increases.
We see this play out everywhere. Unfortunately, some people think this law’s
a problem for evolution. Some people have said that life is basically applied chemistry and chemistry is essentially applied physics So then in that case is biology applied physics? Although, you might say that physics is applied math so I don’t know how far we want to go here. Well without biology there wouldn’t be physicists,
but you have a point. Like anything else, life obeys the universe’s laws. A physicist might say you and a bacterium
are both ordered bunches of particles. You are just a fancier and more complex arrangement.
Surely saying you evolved from something like that breaks the 2nd law? How could evolution
add order and complexity to life? There’s something you haven’t been told
about the 2nd law: it only applies to closed systems, and Earth is not a closed system. If you took a pan of cookie dough, half frozen,
half room temperature and put it in a cold oven, eventually, thanks to entropy, you’d
get a bunch of equally uncooked cookies, even though the total amount of energy has remained
the same. But if we turn on the oven, if we add energy
to the system, our disordered dough can transform into something deliciously ordered. The sun is like our oven, it’s constantly
showering Earth with more energy than we can use.
That energy changes DNA, plants use it to make more plants, animals make more animals,
and we turn it into cookies… all without breaking the law. [BIRD CHIRP] Take a perfectly good book and start changing
letters, and it won’t take long before it’s unreadable.
Information has been lost. Then how did evolution, through a similar
process, morph the simplest life forms into the most complex?
Evolution can create information. Many people think this is impossible, but
there’s several ways we know it happens. When DNA is copied or shuffled to make sperm
or eggs, genes or sets of genes can be duplicated. With an extra copy no longer constrained by
natural selection, the duplicate is free to take on a new role. Nearly all flowering plants, and many grasses,
have had their entire genome duplicated at least once. Organisms can also swap or steal genetic material.
This is most common in bacteria and other microbes, But a good portion of your genome is the remnants
of ancient retroviruses, while nearly half can be traced to even smaller genetic invaders.
These DNA parasites are actually natural selection at its smallest scale, individual units of
information trying to pass on to the next generation via you. Evolution can create information. Nature’s
story may not have an end in mind, but it has no problem adding new pages to the book
of life. [BIRD CHIRP] If humans evolved from monkeys, then why are
there still monkeys? There’s many things wrong with this question,
like the fact we’re more closely related to apes than monkeys. Okay then so why are there still apes? Asking why there are still apes is like saying,
if some Americans and Australians came from British people, then why are there still British people? When we see two adjacent branches out here
on the tree of life, what we mean is that they have a shared ancestor, some organism,
a long time ago, whose descendants took different evolutionary journeys. That’s the way it is for turkeys and T.
rexes, whales and hippos, even hyraxes and elephants. There are still apes because apes are good
at being apes. The point is this: We’re not more evolved
than a chimpanzee. We just evolved differently. It’s often said that evolution is survival
of the fittest. But it’s more like survival of the “fit enough”.
As long as a species’ traits are good enough to survive and reproduce in their environment,
that species will live on. The tree of life is not a ladder. So to all my cousins out there, gorilla, orangutan
or chimpanzee, you’re the best ape you can be. That’s good enough for evolution, and
me. [BIRD CHIRP] A thousand years ago, if you had been born
with genes that made you diabetic, you’d probably die. But not today. Head to small for those extra wisdom teeth?
Well, no more deadly infections, just go to the dentist. Today we don’t face many of the challenges
our ancestors did. Now that we can modify our environment and we live long past the
age we reproduce, some people think we’ve moved beyond natural selection. Recent history is full of examples that we’re
still changing. Many of us carry a mutation that keeps a milk-digesting
enzyme turned on into adulthood, allowing those people access to another source of nutrition. Even more recently, a genetic mutation has
made Tibetan highlanders uniquely adapted to living at high altitudes. That’s practically yesterday when it comes
to evolution. One copy of the mutation that causes sickle
cell disease can protect people from malaria, which is why we see it selected in populations
that live here. In areas where HIV and AIDS continue to be
hard to treat, a gene mutation that provides resistance to the virus will likely become more common. Like every living thing, we’re not an end
product of natural selection, we’re a work in progress.
So if you ever wonder if we’ve reached our evolutionary peak, remember that going farther
is just what we do. [BIRD CHIRP] In 1938, scientists found a very weird fish
swimming off the coast of S. Africa. They were surprised to see it, because the last
time anyone had was in a 66 million year old fossil. The coelacanth has been called a “living
fossil”, but that’s a really dumb name, because it’s very much alive. It’s just
barely changed since the time of the dinosaurs. Now look at us, we inhabit every corner
of the planet. We shape our environment, we control energy, we have big brains that we
use to understand our world and the universe in which it resides. We‘re pretty awesome. But in evolution’s eyes humans and coelacanths
are equally successful. We’ve both made it. Each of us, in our particular environment,
has conquered enough challenges to survive. A side effect of being the only species that
can figure out where it is and where it came from is believing that we’ve somehow climbed
to the top of nature’s ladder. But viewing ourselves as the pinnacle of evolution,
the brightest star in a the galaxy of life, is no more correct than viewing Earth as the
center of the universe. Every species evolves, at different rates,
in response to different environments. Some make it, some don’t, but as long as
we exist, as long as that fish exists, evolution will continue its journey to… well, nowhere
in particular. That evolution doesn’t have a purpose, realizing
there’s no destination in mind, or no trophy for “best species” or “most improved”
waiting at some finish line, can be an uncomfortable thought.
This is how it is with evolution. So… what’s the point?
We’ve studied the night sky for centuries, the same night sky that ancient fish lives
under, and it’s shown us that we’re just one small part of something bigger, that we’re
made of the same stuff as what’s up there. It’s a profoundly humbling experience. But we’ve also learned that our planet has
as much life ahead of it as it’s lived so far, and that the universe has even more still.
Right now, Earth is a tiny bit of life in a tiny corner of a vast ecosystem, and we’re
just a few steps into this journey. That gives us incredible potential.
We understand much of how the universe works, even if we can’t perfectly predict exactly
what it will look like tomorrow. We might not know where we’re going, or
what we might find there, but we’re definitely going somewhere. Ultimately, we’re just
doing what we can with what we’ve got, to reach tomorrow, like everything else in the
universe. And we should feel good about that. That’s
the best we can do. Stay Curious

Comments 100

  • Many of you requested all of the 12 Days of Evolution episodes in one big video, so here it is! Share 'em one at a time, or share the whole thing… whatever feels like the natural selection.

    I hope you enjoyed this series. It was definitely a challenge (a FUN challenge, of course) to make this many videos in a short time and to pack this much information into them. I'm really interested to hear your reactions and feedback, so hit me up on social media or leave a comment below and tell me what you thought. Any other subjects you'd like to see a miniseries on in the future?

    I'll be back in January with a new video!

  • 5:27 This happens frequently with plants. Plants are unusually tolerant to large-scale copying and merger of DNA. Plants can instantly speciate through the occasional whole genome duplication, and since many plants can self-fertilize, the new hybrid can become its own species.

  • I love it! Great video!

  • Im looking at the comments to see if anyone else thinks that the video thumbnail looks like happy wheels

  • It’s a fact

  • Neanderthal is a hoax. This is commonly known and is "settled science". "Nature can't draw up a body from chance"? (He said this). So how did life start? Hint: information!! hnjyugtrvijnmki jimhtygbi. Oh, I mean useful information!

  • Now The Second Law is wrong? How about the First Law? Gravity? You guys will change anything you want to make your point. "Random mutation is how new species come to be". Really?

  • This is really so lame!

  • well done, great video sharing ★

  • Is the nipple thing not related to the chromosomes while being in the womb? As far As i remember the actual gender of a person is in the beginning female. The male chromosomes build Update in the first two months or something like that.

  • i wish i could zoom with my eyes

  • I thought this was happy wheels

  • I've three nipples! It's pretty small and blends in more with my skin, but it there under my actual nipples.

  • Why is the waste management system the same place as the amusement park.

  • These are flipping poems of knowledge! Congratulations you've made english more intresting

  • Charles darwin is a zoophila person like his fans

  • We’re all going to…..

    death

  • Hail lord Dinkan

  • I just wanna know where the spec that supposedly blew up to create universe came from and how life just started happening from nothing but and no one 🙂

  • Can we get that video on multiple nipples now

  • The biggest hoax in the history of the world

  • Adam and Eve had 2 sons ?

  • How about, species singularities

  • But, male nipples can still funnel milk from the hidden modified sweat glands under, it just takes a prolactin boost to get the male close to on par with the female.

  • Dope segment!

  • I believe that everything started off as just a cell like when we are in the womb and we start off as one cell and keep splitting but this cell would have to be a lot more complex so maybe I'm wrong… I don't even know so you tell me lol.

  • Houses are built by human , not nature. The bigger n better, the more money

  • What an ending!
    :, )

  • Love this series. I don’t love the “why are there still British people” analogy, though. It’s a great analogy, don’t get me wrong, but the punchline should be “why are there still Australian people?” ^_^

  • 8:12 last place ribbons are real

  • soooooo is god real?

  • This is pure fantasy. Natural selection is a slave to a random process. This cannot generate new body plans over time. Far too complex. The hoax continues.

  • I'm not here to watch the video I just wanted to say that the thumbnail looks like a Happy Wheels let's play

  • Me: Dad, what's a neanderthal?
    Dad:I guess they're from netherland

  • Wait it doesn’t tell us how life began??? What about where humans are going in the future?

    Or does evolution only explain the middle?

    Ok we’ll surely it explains how the Big Bang begun?

  • 2:51 burning Jiminy cricket

  • Neanderthals were a race of human, Europeans have on average 2% Neanderthal DNA

  • Survival of good enough. I will embrace my mediocrity!

  • To me, evolution is a mom who doesn't give a flying fart about her kids.

  • Men have nipples because we all start out female in the womb.

  • I still don't fully understand Evolution

  • 3:17 do I smell a Sopronos reference? Garry Cooper anyone?
    RIP James Gandolifini

  • comment for engagement!!

  • It's Okay To Be Smart …….. THERE IS NOT ONE SCIENTIFIC FACT THAT SUPPORTS THE THEORY OF EVOLUTION …… SO WHY DOES THE WORLD TEACH IT AS IF IT WERE FACT ?????

    I think i'll let Plato answer this question ;

    Plato said:
    (1) Who will teach the children ?
    (2) And what will they teach them ?

  • But why do I have had a total of 5 wisdom teeth?

  • Varda Narrainsawmy I am quite sure it is called " The Theory of Evolution" and hypothesis is different I mean you might have it confused not me

  • This is an incredibly precious video! Bravo!

  • Thanks for the video i felt curious;)

  • People will believe what they will believe, and there is no stopping that. You might say that there is no proof of evolution, and it is all just a hoax. But is there any more proof of anything else? This is the best theory I got and I am sticking with it.

  • Milk is for babies. FACTS. And the human race is a hybridization cross breed between extra terrestrials and apes. FACTS. No other animal on earth continues drinking milk from another SPECIE in adulhthood. Whacky humans.. Look up chromosome 2 it is a telamere to telamere fusion between 2 chromosomes from DNA of Apes and extra terresital. We are at a time where we can cut genes and create cross breeds. Now imagine that been done to us. 100%.

  • Did you know that some men can actually produce milk from their nipples so thats possibly why men have nipples
    Key word: Some

  • I used to be stupid and ignorant, now i'm smart

  • I can see them… if I want

  • kawahi lenords name makes sense now , the quiet cricket

  • Okay the 2nd law part is the most weird part.

  • The second law of thermodynamics only applies in an isolated system, not in a closed system, and it doesn't say that disorder always increases but that the entropy of an isolated system doesn't decrease.

    https://rationalwiki.org/wiki/Laws_of_thermodynamics#The_second_law

  • Hey, just see this part from 0:43, I think this is the basic explanation behind the Evolution theory…..
    There a case of mutation and luckily the mutated animal survived a catastrophic event while the original died……….
    so it’s not adaptation it’s just that mutation got lucky 😅

  • I believe evolution, mutation and adaptation……..The fact that human skin colour is an outcome of mutation is clear and it’s something that can be believed (if you watched this video carefully).The fact that there are other adaptations coming into play (as depicted in the video) is really a great fact to know………….
    but how in the world did I come from a single celled organism. I don’t believe that because there are no intermediate-organism fossils out there that support that. Many say that we came from apes, that’s not correct, we and apes came from a common ancestor is correct. Or is it? Because, those theories (and also those scientists) that say we came from a common ancestor also say we came from a single celled organism, and I don’t think there are a few fossils to support that, I’ve never came across a news article or a video at least…… and how can one say that a species is a common ancestor? Because there are studies that say that’s true and there are, again, studies that say they are not true( by religious people). I am religious and I believe God. Remember I said at first I believe Evolution, so my belief in a broad sense is that we were made by God and all the other species too. And God has set the Evolution processes and Mutations to occur at times to bring those minute changes in same species (also shown in the video)
    We really need unbiased scientists who should look into this topic and give a final conclusion, whether we are made by God the Almighty Creator, or we just are offspring of numerous mutations in series.

  • He is a great explainer 👍👏🏿👍👍🤜👍👍👍👍👍👍👍👍👍

  • Correction, pigeons do ride the tube. Saw it myself in London.

  • Anyone else thinks that it's a happy wheel video from the tumbnail?? :V

  • awesome

  • The people before Newton knew that apples fall from tree without no reason. If someone asked "Why apples dont't fly?" everyone would laugh at him. This is true for the principle of "natural selection". Why this phenomenon happens? You might say "this is how it is" or justify it. Again, ask yourself about the last statement, and continue. I believe the last chain would be "Because God intended that".

  • There is no point to life. If there is, we have no significant impact to it. I love science but maybe we should stop

  • there's not 2 genders moron

  • Okay, now how do I get this in Spanish? I'd like to show it to some friend

  • God less lier Darwin is in HELL believe it or not

  • Can I please have a VR copy of that hot guy in his underpants, he's exactly my type, it's for…. science….

  • Natural selection is a joke.

  • Natural selection coming from a guy that wears glasses
    .

  • How did the eye know that there was anything to see to began its thousands years to develop?

  • How did evolution know that 100,000 years to develop wings on a rat that it could fly

  • What bullshit this is

  • This gives the false impression that natural selection accounts for all evolution. This is untrue. Natural selection is responsible for changes within a species but can never transform it into another species. Since another species is incapable of reproduction with a different one, this route is not open to pass on changes. Also there is not enough time to explain what would be an incredibly long hit or miss process.
    Man has 'evolved' (by the survival of the fittest) to become completely unfit to survive in nature. How do evolutionists explain that?

  • Why do evolutionists talk as if animals knew what they wanted to evolve into?

  • whos watching this in 2019?

  • Where are the missing links moron? You must be tthe missing link. Since your evidence are nothing but conjectures. British and American whites are both human, they are just different countries. That's different from claiming we came from apes, yet the apes still exist. Adaptation is different from evolution. Evolution claims an amoeba became human which is impossible, as there hasn't been any documented observation, after all science says you have to observe it and verify it before you can claim it as fact. Adaptation is having different eye colors because of your environment like DNA food and sunlight, but your eyes remains to be eyes and does not mutate into a vagina just like your eyes moron.

  • And then you can tell us where the zillions and zillions of generations of failed creatures ended up. Surely there must be evidence of all the failed attempts that didn't quite make it. That would involve generations of zillions of creatures that had either become extinct or carried on. And then, pray tell, where did the grass, trees, shrubs and fruit all come from. How could fruit evolve without knowing it would need bees to carry the pollen? And then, since this science, why doesn't it not follow the scientific method that was laid down in the 16th century. Why wasn't The Origin of the Species ever peer reviewed? Natural selection and pure chance are really the same thing.

  • 5:05 so the creature with the evolving eye must stay alive, and its offspring and its offspring repeated by 1000s of its offspring must all live past maturity to pass on there forming eye mutation to the next generation.and must for 1000 of generations

  • First Natural Selection was the big proof evolution. Then it was brought up to the attention that natural selection is false and evolution because usually the strongest man the fastest male were the ones who died in battles died in hunting parties went out and died looking for new land so they had to change from natural selection to just random selection. And they will use this now until finally we brought up to attention that this is has to be wrong to because even random selected mutations die in accidents therefore they cannot spread their mutations for further Generations. In the eyes are very complex organs and not simple as a video States

  • Yes I believe that a grizzly bear in a million years can evolve into a dragonfly or even a seahorse. And also by some random mutation in a species a working armed, or limb as importamtl to survival will go through half a million years with a deform non useful limb before it involves into a wing that will bring flight to the species all this without Evolution knowing the capabilities and possibilities of flight.

  • '…eyes are easy to evolve.' What a joke! Repeat a stupid lie often enough and people will believe it.

  • 7:38'😂

  • "Congratulations on being good enough" made me laugh a lot hahaha.

  • Se numeste adaptare nu Evolutie . Sunt destul de dezamăgită de canalul asta

  • Houses have genes and can reproduce?

  • Facebook doesn't allow female nipples to evolve

  • Does anybody know if we’re being taxed on these theories?

  • 648 creationists dislike this video

  • Evolution explained by the all knowing church

    put the money in the bowl and pass it on. Stop asking questions and keep listening

  • This was a really good video. There was only one thing I think you got wrong or at least didn't emphasize enough; that being the fact that we didn't just come from apes; we ARE apes. We are just as much an ape as our ancestors that were apes. We never stopped being apes. Likewise, modern birds are descendants of dinosaurs and thus are still dinosaurs. Ancient dinosaurs from before the mass extinction event are known as non-avian dinosaurs to differentiate them from modern dinosaurs (birds). Life doesn't evolve from one thing into something else. It continues to be what it has always been, but with just more. If you take a dog and breed it in a way that it has exactly the same features as a cat, it looks like a cat, meows like a cat, has the temperament of a cat, it doesn't become a cat. It is still a dog. You can't change who you are descended from.

  • Have nothing wrong with the topic you're covering, but I would prefer it if you wouldn't make the title a mock of a Christmas song.

  • Actually life on Earth has considerably less than a billion years left before one disaster or another renders it sterile.

  • Cool video. However, humans are still apes. It's a biological superfamily in which we belong.

  • Every time I see a great evolution video I can’t help but think that most of the people who need to see it probably won’t.

  • The ultimate aim of evolution is to transcend and expand the life way beyond…perhaps the Universe.

  • i do not understand evolution, therefore god.

  • mosquitos latin name is f. molestus XD lolllllll

  • Wait…. light sensitive cells in a single cell?? Please explain?

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