Answer: B) k
Explanation:
potassium is an intracellular cation.
In resting state its gated channels are shut; so 95% are trapped inside the interstitial fluids of the axoplasm;Although these channels leak for some to escape down the concentration gradient to the extracellular environments of the axon, most of these ion are concentrated inside the interstitial fluid of the axon to maintain RMP
Between the atmosphere and hydrosphere
The layers above would be not as old and the layers below would be the older layers.
