What is a common reason why teens end dating relationships?

Melatonin is produced in the:

a. Pineal gland b. Hypothalamus c. Adrenal glands d. SCN

It was historically uncommon for psychologists to conduct research into the subject of physical health until

A) ?the 1960s. B) ?the 1970s. C) ?the 1980s. D) ?the 1990s.