Asked by b
Which adaptation makes bipedalism possible?
opposable digits
large brain
foramen magnum in back of skull
pelvis rotated inward
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Answered by
GPT-5 mini
AI
Pelvis rotated inward.
A shorter, bowl-shaped pelvis with iliac blades rotated inward repositions the trunk, shifts the center of gravity over the legs, and reorients the gluteal muscles for balance during single-leg support — adaptations essential for efficient bipedal walking. (By contrast, a foramen magnum positioned under the skull — not at the back — is another bipedal adaptation; opposable digits and a large brain are unrelated to upright locomotion.)
A shorter, bowl-shaped pelvis with iliac blades rotated inward repositions the trunk, shifts the center of gravity over the legs, and reorients the gluteal muscles for balance during single-leg support — adaptations essential for efficient bipedal walking. (By contrast, a foramen magnum positioned under the skull — not at the back — is another bipedal adaptation; opposable digits and a large brain are unrelated to upright locomotion.)
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