Wich of the factors below is not critical in developing good physical fitness? a: environment b: behavior c: age d: heredity

D heredity is not critical granted it can be a motivator it is not critical age is because depending on your age you will need to figure out your best routine, behavior because your self control to actually exercise plays a key part and environment can also play a key role in how you exercise and get fit.

''C Age'' is your answer because it does not restrict your physical fitness.

Band cthe nucleus of the atom

Ican only answer your first question, a machine is like a human body because it's a little similar. they both almost work like the same.