Answer is A
Firstly axon must reach the threshold level and then depolarisation occurs. Depolarisation phrase means sodium enters and potassium leaves the axon . Choice C can't be because main idea is the entering of sodium ions.
I think it’s the phenotypes
True. Anabolism builds complex molecules from simpler ones, while catabolism breaks large molecules into smaller ones.
Evpor in water it's became rain clouds it was moving place to place
