Researchers have found that animals _____ with one another.

Kanzi, the chimpanzee, communicates with researchers by using

The debate over whether animals use real language centers around

Near the end of one's _____, oil glands in the neck and around the eyes begin to malfunction, contributing to wrinkles in those areas.

The cessation of ovulation and the menstrual cycle is called

Which statement is accurate regarding males and the lifespan?

The changes that people who menstruate experience 5 to 10 years prior to menopause are

In Erik Erikson's view, unfinished issues of identity lead to _____ in young adulthood.