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Describe two features that differ between the skeletons of Australopithecus afarensis (lucy) and Homo Ergaster (The Nariokotome boy) that indicate that Homoergaster was a more efficient biped

User Kimchy
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Final answer:

The shape of the pelvis and the length of the legs are two features that differ between the skeletons of Australopithecus afarensis and Homo ergaster, indicating that Homo ergaster was a more efficient biped.

Step-by-step explanation:

Two features that differ between the skeletons of Australopithecus afarensis (Lucy) and Homo ergaster (The Nariokotome boy) that indicate that Homo ergaster was a more efficient biped are the shape of their pelvis and the length of their legs.

Australopithecus afarensis had a pelvis that was shorter and wider, similar to that of modern humans. This pelvic shape is associated with efficient bipedal locomotion. On the other hand, Homo ergaster had a relatively narrow and long pelvis, which is less conducive to efficient bipedal walking.

In addition, Homo ergaster had longer legs compared to Australopithecus afarensis. Longer legs provide a longer stride length and increased efficiency in bipedal walking. Australopithecus afarensis, on the other hand, had relatively shorter legs.

User Yoonkyung
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