The various types of depression have different causes as well as different levels of severity. which of the following best describes clinical depression?

1)a feeling of overwhelming sadness that usually follows a traumatic event
2)a medical condition that may occur due to a chemical imbalance in the brain
3)alternate feelings of extreme happiness and extreme sadness

♥ Answer is; 2) A medical condition that may occur due to a chemical imbalance in the brain.

People who utilizes the progression principle will ensure their exercise program increases in frequency, intensity, time, and type. the changes need to happen gradually in order to ensure they make gains in their fitness program. a person who doesn't utilize the progression principle can still gain health benefits from exercising, but will not continue to improve in cardiovascular fitness.