Author Question: A national survey of adolescents revealed that of those using social networking sites, ________ ... (Read 84 times)

jho37 · **on:** Jun 22, 2018

A national survey of adolescents revealed that of those using social networking sites, ________ percent had been contacted by someone they didn't know.

a. 10 c. 40
b. 20 d. 80

Question 2

Infant vocalizations, which begin at around age six to eight weeks and are primarily vowel-like sounds, are called babbling.

Indicate whether the statement is true or false