Question

the cell membranes main function is to (1 point)
regulate which materials enter/ exit the cell
protect the cell structurally
control where the cell moves within the organism
dissolve old/ worn out organelles

Explanation:

The cell membrane is a selectively - permeable barrier. It allows certain substances to enter and exit the cell while blocking others, regulating the cell's internal environment. Structural protection is more of a function of the cell wall in some cells (not the main function of the cell membrane). A cell's movement is controlled by its cytoskeleton and other factors, not the cell membrane. Dissolving old organelles is a function of lysosomes.

Answer:

Regulate which materials enter/ exit the cell