B. Macromolecules is the answer.
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
Explanation: The biological fitness of an organism is dependent on its ability to survive and reproduce in a given environment. A trait that increases ability to survive, but makes an individual sterile, decreases fitness because the organism cannot produce offspring to carry on the trait.
thank you
please mark as brainliest
The process called menstruation.
