In a resting potential, an example of a cation that is more abundant as a solute inside a neuron than it is in the interstitial fluid outside the neuron is
a. cl
b. k
c. hco₃
d. na
e. ca

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

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.