Achieving sexual maturity is mostly governed by __________, while learning to swim or to use a computer is primarily a matter of __________.

Which of the following is part of the peripheral nervous system?

a. the nerves c. the muscles b. the spinal cord d. the brain

Which of the following properties of gases distinguish them from liquids—that is, are unique to the gaseous phase of matter?

1. Gases fill the available space. 2. Gases exhibit viscosity. 3. Gases exert pressure. 4. Gases are readily compressed. a. 2, 3, and 4 only b. 1 and 3 only c. 2 and 4 only d. 1 and 4 only