Jill was the first moving object a newly hatched chick saw. The chick later followed her around, just as if Jill were the chick's mother. The chick's behavior is a result of

Rudy is a 16-year-old that likes to brag about his recent development of underarm hair. He says that he is a man now and that he is an adult. Rudy's development of underarm hair is an example of a(n)

a. adolescent growth spurt. c. secondary sex characteristic. b. primary sex characteristic. d. secular trend.

The concept of __________ helps explain why pairs of identical twins reared apart during childhood and later reunited may find that they have similar hobbies, food preferences, and vocations

A) passive gene–environment correlation B) gene therapy C) evocative gene–environment correlation D) niche-picking