Which of the following is often provided by anthropologists and biologists as a possible explanation for the development of bipedal hominids?
a. standing upright allowed for sightlines over tall grasses and savannah shrubbery
b. standing upright allowed for better tree climbing
c. standing upright allowed for more efficient movement
d. standing upright allowed for better foraging of tree fruits

The answer is C. Standing upright allowed for sightlines over tall grasses and savanna shrubbery

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if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.