Preschoolers have a tendency to try to make up a reason why things that they see and hear occur. This tendency is known as

How many genes found on the Y chromosome trigger the testes to produced testosterone?

a. 1 b. 2 c. 3 d. 4

Attention-deficit hyperactivity disorder is diagnosed ________________ in the United States as

compared to other countries. a. at the same rate b. less frequently c. more frequently d. ten times as frequently