How does insulation keep building cool in the summer?

It slows down the entry of heat through the walls and ceiling.  

Explanation:

Insulation is a poor conductor of heat.

Thus, it takes a long time for the heat of the sun's rays to penetrate to the inside of the building.

If the building was cool to start with, insulation will help it stay cool longer.

answer; polycythemia is the correct answer;

hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

hope this   and an i get brainlsiest