Question

what is the main function of the smooth endoplasmic reticulum in an animal cell? to fill the space between the cell membrane and the nucleus to make lipids to store water, waste, and nutrients, such as sugar, in the cell to control which substances enter and leave the cell

Explanation:

The smooth endoplasmic reticulum (SER) in animal cells is involved in lipid synthesis. It is not responsible for filling space between membrane and nucleus, that's cytoplasm's role. Storage of water, waste and nutrients is a function of vacuoles. Controlling substances entering and leaving the cell is the job of the cell - membrane.

Answer:

to make lipids