Where on the physical activity pyramid do sedentary activities belong? The Physical Activity Pyramid: Top level of pyramid is Sedentary activities, Second level is Anaerobic and Flexibility activities, Third level is Aerobic activities, and bottom level is Lifestyle activities.

A. A

B. B

C. C

D. D

fluid balance is an aspect of the homeostasis of organisms in which the amount of water in the organism needs to be controlled, via osmoregulation and behavior, such that the concentrations of electrolytes (salts in solution) in the various body fluids are kept within healthy ranges. the core principle of fluid balance is that the amount of water lost from the body must equal the amount of water taken in.