The nervous system isn’t only

for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .

i think the answer is a.keratin is the pigment responsible for skin color.

because it travels in smaller waves then all other colors, causing it to be the most visible color