The s*x of a person is: begins at birth, parents have a role in this

biological and physical attributes a person has, their reproductive system

masculine or feminine behaviors of a person

culturally assigned roles

biological and physical attributes a person has, their reproductive system

BUT gender doesnt equal genitalia

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.