Approximately what percent of American teens say that they connect to the Internet at least once per day?

Johnny is taking a class in human sexuality, and he has been asked to make a list of body parts that would be considered primary sexual characteristics. Which of the following would not appear on that list?

a) uterus b) testicles c) ovaries d) breasts

Many of the genes that are more active during sleep are involved in ___

a. protein synthesis b. modification of synapses c. memory consolidation d. All of the above