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The First Part Of Pbs's Documentary Being Human

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In the first part of PBS’s documentary becoming human it aims to explain how humans became to walk on two feet or being bipedal and why humans are the only ones left. For millions of years there was many humans like creature that roamed the earth until it was just humans. Being bipedal makes humans unique and makes them different from apes. There are many theories on how human ancestors became bipedal and started walking on two feet. One of the theories is that human ancestors stood up to see over tall grass. Another theory is that they stood to grab fruit from low branches off the trees. Also that they stood up so they can cool off better so that they don’t so much sun on their bodies. The best theory or hypothesis is that standing up cost
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