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Humans evolved to walk on two legs, or bipedalism, for several advantages including better visibility to spot predators and more energy-efficient long-distance travel. This adaptation allowed for free hands to carry food and use tools, significantly influencing human evolution, culture, and social structures. Over time, bipedalism became a defining trait of humans, despite modern lifestyles leading to poor posture.

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18 views1 page

5 Rev 2

Humans evolved to walk on two legs, or bipedalism, for several advantages including better visibility to spot predators and more energy-efficient long-distance travel. This adaptation allowed for free hands to carry food and use tools, significantly influencing human evolution, culture, and social structures. Over time, bipedalism became a defining trait of humans, despite modern lifestyles leading to poor posture.

Uploaded by

lcl48888
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Rachel: Okay, I have a question—why did humans start walking on two legs?

Wouldn’t it have
been easier to stay on all fours like other primates?

Noah: Good question! Bipedalism actually gave early humans a lot of advantages. One big
theory is that it helped them see over tall grass and spot predators more easily.

Rachel: Huh, that makes sense. But wouldn’t walking on two legs make them slower?

Noah: Not necessarily. Walking upright is more energy-efficient over long distances. Early
humans could travel farther without getting tired, which helped them find food and survive.

Rachel: So it’s basically like upgrading from gas-guzzling to fuel-efficient?

Noah: Exactly! Plus, having free hands was a game-changer. It allowed humans to carry food,
use tools, and eventually develop complex culture.

Rachel: Ohh, so bipedalism wasn’t just about movement—it shaped human evolution in a bigger
way.

Noah: Yep! It influenced tool-making, brain development, and even social structures. Some
scientists think it also helped with thermoregulation, since standing upright exposes less body
surface to the sun and helps keep the body cool.

Rachel: That’s wild! So we walk on two legs because it helped us survive, adapt, and evolve?

Noah: Pretty much. It might have started as a small advantage, but over millions of years, it
became the defining trait of humans.

Rachel: And now we spend all day sitting at desks, ruining our posture. Evolution really came
full circle.

Noah: Yep, our ancestors worked so hard for bipedalism, and here we are slouching.

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