Why do capillaries need to be thin walled?
a so only a few nutrients can pass through
b so only a small amount of blood can flow through
c so they can go through the small spaces within the body
d so the exchange of gases and nutrients can happen

D

Explanation:

Capillaries need to be thin walled because their main job is gas exchange. Capillaries are an important part of your circulatory system. They are very small blood vessels found throughout your entire body.

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the sun's light combined with the visible wavelenghts form what is called ultraviolet radiation, which are the long waves at the end of a visible light sprectrum.

hope it ,

bioteacher101