Parts of Your Body That Prove You’ve Evolved


– [Narrator] Since surviving in the wild like our ancestors did, us humans have undergone
some dramatic changes. We’ve lost certain
capabilities and gained others. Through evolution, some parts
of our bodies have disappeared and others have appeared. Let’s take a look at the traces left on our body as evidence. Here are 10 parts of your body
that prove you’ve evolved. (whimsical music) – Amazing. – [Narrator] Number ten, tailbone. Humans used to have tails that assisted us with balance and mobility. However, as time passed we
didn’t need them anymore, so we eventually lost them. Proof for this is the
presence of our coccyx, more popularly known as the tailbone. This bony structure is found
at the end of our spine and looks like a small fused bone. All mammals had a tail at some
point in their development, even you did, at around
four weeks of gestation. Our embryos are similar to
that of other vertibraes, showing visible tailbones. However, like apes, tail
cells are programmed to die. However, in rare circumstances, a mutation allows our
ancestral tail to form. Many of these people have had their tails surgically removed. But was it truly useless? Various sources say that it
was actually very useful. Despite being a vestigial tail, it served as an attachment site for tendons, ligaments, and muscles. It’s also said to be
an important component in weight bearing when sitting down. So, that being said, it
is proof of our past, yet it still has function to this day, no matter how minimal. Number nine, palmar grasp reflex. This reflex proves that
evolution is not just evident in body parts, but can also be observed from behaviors that disappear over time. One of which is whats called
the palmar grasp reflex. Have you noticed how a newborn
will hold onto anything, say a finger, when it
gets its hands on it? This is the palmar grasp reflex. Newborns instinctively
hold tightly onto anything that even during sleep
this reflex activates. And it isn’t just with hands. It can also be seen by their feet as well. So, what is the point of this exactly? Some suggest this vestigial trait comes from infant primates who
hold on to their mothers. As the child grows, this
behavior also fades. So simply put, it’s something that keeps a
young baby safe from falling. Although, of course, I donut suggest you try having one hang by a stick! That would just be extremely reckless! Number eight, third eyelid. Have you watched Men in Black where Will Smith chases someone, and then this person blinked sideways as if he had a third eyeball? Freaky isn’t it? But the thing is, we
used to have that too! That’s right, we used to
have a nictitating membrane and all that’s left of
it is that tiny pink fold at the inner corner of our eyes. Other animals, such as
fish, reptiles, and birds, still have this membrane. Its main function is to keep
the eyes safe from debris. So, why donut we have it anymore? Long story short, we no
longer have any use for it. We depended on our eyesight
for hunting a lot more in the past. So much that we had third eyelids that kept our eyes moist
without having to blink. But now that we live in
groups and don’t hunt as often as before, it went away, leaving that pink tissue behind. Number seven, wisdom teeth. One of the biggest pains of growing up is having wisdom teeth. It’s a painful process when it emerges, and if you’re unlucky, it might even grow in a way
that pushes your other teeth. And that’s an expensive
trip to the dentist. But did you know that’s
actually a remnant of evolution? The prehistoric version of man is thought to have had bigger jaws and
rather unrefined culinary tastes in comparison to how we eat now. They had a great need for 32 teeth and our extra molars played
a vital role in chewing food. And then we learned how to
use fire and cook what we eat. Our jaws became smaller,
so there isn’t much space for the 32nd molar anymore. And you know what? Some are even lucky to not
grow any wisdom teeth at all! Number six, wiggling ears. Now heres a neat trick that some of you might have seen at parties. Can you wiggle your ears
without actually touching them? Like they do it on their own? Well that’s yet more proof
that we have evolved. So, how do people do it? It’s all down to the
three muscles attached to our outer ear known as auriculars. Those who can wiggle them
have pretty strong ear muscles to say the least. Other mammals do actively
use these muscles that allow their ear to move, assisting them with locating
the sources of sounds. Just look at a cat when they try to listen and you’ll see the muscle in action. So why aren’t we equipped with
super nimble ears anymore? Again, it’s due to the
fact that we no longer need to be as good at hearing as
when we were hunter-gatherers. Interestingly enough though, we can still detect that
our ears move instinctively to subtle sounds. Research confirms this
as electrodes fitted onto ear muscles detached a
response from test subjects when they were exposed to subtle sounds. Number five, goosebumps. When was the last time you felt the hair behind your neck and arms rise? Was it after feeling a sudden
chilly breeze on a hot day? Was it when you listened
to a memorable song that pulled strings within you? I’m talking about goosebumps, and yes, they’re yet more proof
of how weave changed. You see, our hairs stand on end because of what we call the arrector pili muscles. These are also present in
other mammals, such as a cats, which appear larger when threatened. So for one, they’re
used to show dominance. They’re used as protection
from the extreme cold. Raised hairs increase the
space between each hair, providing animals with better insulation. Just look at a puffy bird
freezing its feathers off. So that explains why they
appear when we’re cold, although showing dominance
through goosebumps may have served us long
before we were hairy. As for goosebumps when
we remember something, you can attribute that to adrenaline. It stimulates a flight-or-fight mechanism brought about by extreme emotion, causing that undeniable
physical manifestation. Before going onto the next one, let’s have a little trivia question. Aside from fame, what do
Mark Wahlberg, Lily Allen, and Harry Styles have in common? The answer is they all have
the next vestigial trait. Number four, extra nipples. Yes, Mark, Lily, and Harry
all have extra nipples. That’s kind of weird, right? Well, not really. In fact, its estimated that
5% of the world’s population has more than two. You can attribute them to our development during the embryonic stage
when something goes awry. But it’s not necessarily
harmful to anyone. Some people could have
three nipples, some four, and there’s even a guy who
had a total of seven nipples! But how is this proof of evolution? For starters, other mammals, such as dogs, have numerous nipples
and it serves them well since they have more than
one offspring per birth. Apparently, there was a time
when our ancestors were able to have more than one child
as well, so there’s the use. Number three, palmaris longus muscle. Here’s what I want you to do. With your palms faced up, make your thumb and your
little finger touch each other. Do you see a line on your
wrist when you do that? That’s the palmaris longus muscle. This tendon that you just saw
on the underline of your wrist is actually a sign of evolution. And the thing is, only 14% of
the population donut have it! But what exactly does it do? You see, its believed
that our ancestors relied on the wrist’s flexibility for locomotion, and the palmaris longus muscle
played a huge role in that. If you try to look at other
animals, such as monkeys, they have extremely developed tendons that help them swing
from one tree to another. Now it somehow makes sense
how we are related to them! For us modern humans, however, it has minimal to no effect at all. As a matter of fact,
surgeons often use them for cosmetic surgery and other grafts. If anything, it’s a subtle
sign that we’ve changed. Number two, plantaris muscle. We already know how the palmaris longus
muscle supposedly aided us in swinging from tree to tree, right? Now if you observe primates,
they also use their feet. And the foot counterpart
is the plantaris muscle. Unlike the palmaris longus, you can’t see it just
by looking at the area. You have to properly examine it and it can only be recognized
by visualizing the muscles. It has been considered
as a weak contributor to flexing the foot, thus its
considered a vestigial trait. So how was it probably used in the past? It helped us with navigating
from one tree to another, not just with our hands,
but also with our feet. But since evolution kicked in, we no longer need the plantaris muscle as we effectively walk on our two legs. Before I reveal the most
outrageous example in this list, I’d like to remind you to
subscribe to Be Amazed. We upload amazing
fact-filled videos every day. So don’t miss out on learning
some amazing, new information. Also, hit that bell icon for notifications on more amazing fact-filled videos. Number one, eye color
and the epicanthic fold. They say that eyes are
the windows to the soul. Little do we know that
they can also tell us about how weave evolved. Take the color of our eyes as an example. Its commonly agreed that
our earliest ancestors came from the continent of Africa. Because of their direct
exposure to ultraviolet rays and warm temperatures, their skin turned dark and
influenced their genes. The same genes are also
responsible for our eye color. Thus, the first prominent eye colors were either dark brown or black. It was during migration to
other parts of the world that new eye colors, also
influenced by other factors, came to be. As for blue eyes, its thought that they helped humans withstand the dark, depressing days of the Neolithic European winters better than those with brown eye colors. Another mystery to do with our
eyes is the epicanthic fold, commonly associated with
people of Asian descent. Many theories have risen to explain it. Some believe the fold
acted as a sun visor, protecting the eyes from overexposure to ultraviolet radiation, or as a blanket insulating
them from the cold. Others however, contradict this, saying that a substantial portion of the Asian population evolved in areas outside of the
tropical and arctic regions. Dr. Frank Poirier, a
physical anthropologist at Ohio State University, instead attributes the
fold to pleiotropic genes, which are simple genes that control more than one
characteristic or function. But he has no explanation for its origin. Despite its origins, it’s
still proof that weave changed. And they donut call it
a mystery for nothing! Which vestigial body part
astounded you the most? And, are there other vestigial features that you can add to the list? Let me know on the comments down below. Thanks for watching! (whimsical music)

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