Question

can you use any of the top tips above on this example? try it yourself first, then click \show explanation\ to see how we do it! example inferences one theory behind human bipedalism speculates that it originated in a mostly ground - based ancestor that practiced four - legged \knuckle - walking,\ like chimpanzees and gorillas do today, and eventually evolved into moving upright on two legs. but recently, researchers observed orangutans, another relative of humans, standing on two legs on tree branches and using their arms for balance while they reached for fruits. these observations may suggest that ______ which choice most logically completes the text? choose 1 answer: a bipedalism evolved because it was advantageous to a tree - dwelling ancestor of humans. b bipedalism must have evolved simultaneously with knuckle - walking and tree - climbing. c moving between the ground and the trees would have been difficult without bipedalism. d a knuckle - walking human ancestor could have easily moved bipedally in trees.

Explanation:

The text mentions orangutans, human - relatives, standing on two legs in trees while reaching for fruits. This implies that bipedalism could have been advantageous for a tree - dwelling ancestor of humans. Option B is incorrect as there's no indication of simultaneous evolution. Option C is not supported as there's no mention of difficulty moving between ground and trees without bipedalism. Option D is not supported as the focus is on orangutans in trees, not on knuckle - walking human ancestors moving bipedally in trees.

Answer:

A. bipedalism evolved because it was advantageous to a tree - dwelling ancestor of humans.