One primary function of the cell membrane is 1) regulating the flow of simple sugars into or out of the cell
2) synthesizing substances by breaking down cell organelles
3) storing carbohydrates, water, and starches for future use
4) digesting carbohydrates, fats, and protein

I am guessing the 1st option

Explanation:

Because it regulates the movement of substances in and out of cells.

i'm pretty sure it's spores

it would affect precipitation by causing flooding in some areas of the world due to climate increasing, causing the glaciers in the northern and southern pole of our planet to melt.

i wish you would have provided choices to simplify it and allow me to give an exact answer.