Darwin's hunting hypothesis,Rodman and McHenry's patchy forest hypothesis,and Lovejoy's provisioning hypothesis are three very different explanations for the rise of hominins,but all three invoke the same anatomical feature. What feature is this?

Question

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The anatomical feature that all three hypotheses invoke is bipedalism. Darwin's hunting hypothesis suggests that hominins evolved bipedalism to become efficient hunters, Rodman and McHenry's patchy forest hypothesis proposes that bipedalism evolved to navigate the sparse tree cover in open savannahs, and Lovejoy's provisioning hypothesis suggests that bipedalism evolved to carry food and resources back to a central location.

Darwin's Hunting Hypothesis,Rodman and McHenry's Patchy Forest Hypothesis,and Lovejoy's Provisioning