According to the all-or-none law:

Question

A. all axons in an area will fight at a given signal.
B. an axon moves from its resting state with various degrees of stimulation.
C. only sufficient electrical activity will cause the axon to fire.
D. there is a gradual build up of electrical activity before an axon can fire.

I believe it is C

Answer 1

correct

Answer 2

Optimum physical health usually occurs:
A. between the ages of 15 and 21.
B. between the ages of 18 and 25.
C. between the ages of 25 and 40.
D. between the ages of 40 and 55.

The answer is B

Answer 3

I agree.