MC. Which of the following is not a trait used to distinguish the order primates from other mammals?

A. Grasping hands and feet

  • B. Ability to walk upright

C. Fingernails and sensitive fingertips

D. Eyes are used together stereoscopically

MC. Gorillas live in male-dominated groups, with a single adult male and several females. Adult male gorillas compete to control these groups. Chimpanzees live in large, mixed social groups. Adaptively speaking, we might expect _____ to have larger genitals, because _____.

A. chimpanzees; they have access to more sexual partners

B. gorillas; they have access to more sexual partners

  • C. chimpanzees; they are more likely to use their genitals as part of sexual competition

D. gorillas; they are more likely to use their genitals as part of sexual competition