Bonobos are a close primate relative to humans, sharing 98 percent of human DNA. Bonobos are particularly interesting to use when studying aggression because they are
a. highly aggressive primates who are known to brutally attack one another.
b. led by a male hierarchy.
c. very peaceful and led by a female hierarchy.
d. the only other animal with the hormone testosterone.
Question 2
Researchers have found that testosterone levels are significantly higher in men ________, suggesting a ________ contribution to aggression in humans.
a. from abusive homes; biological
b. convicted of violent crimes; biological
c. from lower socioeconomic backgrounds; social
d. convicted of property crimes; biological