Question

what is the main function of the endoplasmic reticulum in an animal cell?

to fill the space between the cell membrane and the nucleus

to break down waste and worn - out cell parts

to direct cell activities by sending instructions to different parts of the cell

to help ribosomes make proteins

Explanation:

The endoplasmic reticulum (ER) has two types: rough ER (with ribosomes) and smooth ER. The rough ER helps ribosomes in protein synthesis. The first option is more about cytoplasm. The second is lysosomes' function. The third is nucleus' role (as it contains DNA which directs cell activities).

Answer:

to help ribosomes make proteins