Girls menstruated at an average age of 16 in the nineteenth century, but today some girls reach menarche as early as age 9. This phenomenon is called the _____ trend.

The cerebellum ______

a. controls blood pressure b. is involved in emotional behavior c. coordinates actions so that movements are efficient d. relays messages from the sensory receptors

Oscar and his mother are looking at a picture book. Oscar’s mother points to the duck and labels it. When Oscar’s mother points and names the duck, Oscar also looks at the duck. Oscar demonstrates:

a. social referencing. b. guilt. c. joint attention. d. passive protest.