An episode of intense sadness that may last for several months is called ______

In the United States today, about what percent of all marriages are second marriages for one or both partners?

a. about 10% b. about 25% c. about 33% d. about 50%

Constriction of blood vessels occurs via the:

a. Sympathetic nervous system b. Parasympathetic nervous system c. Both the sympathetic and the parasympathetic nervous systems d. None of the above