C. Janine should increase the intensity or length of her excercise programs because it is more difficult to maintain high fitness levels as you age.
Levels found in the human body that can be tested through urine
Homeostasis is maintained by sweating because it helps the human body cool down when it is warmer than its normal healthy temperature. The water sweating puts on the skin absorbs a large amount of heat from the body as it evaporates. Hope this answers the question.