Consider species A, B, and C, who share a knuckle-walking common ancestor. Species A and B are bipedal. Species C is a knuckle walker. Which of the following is most likely to be true?

The hallmarks of modern human behavior are partly due to cognitive ability and partly due to a(n)

Which bones can provide evidence that a fossil animal was bipedal?

A femur from a bipedal primate __________ than that of a quadrupedal primate.

If energy is devoted to current reproduction, from where are those energy resources diverted?

Scientists conventionally divide the causes of human variation into what two categories?

One of the most striking differences between humans and other social mammals is that humans can cooperate in __________ groups of __________ individuals.

Which of the following statements is true of sexual selection?

How do children acquire most of the knowledge they need to survive?

What is the ultimate source of all new genetic variation?