Question

what does it mean for a membrane to be selectively permeable? only certain molecules are allowed to pass through. the membrane is rigid and only allows water to pass through. all types of molecules are able to pass into the cell. the membrane is rigid and nothing can enter or leave the cell.

Explanation:

A selectively - permeable membrane controls the movement of substances. It has specific properties like pore size and chemical nature that allow only certain molecules (such as small, non - polar molecules or specific ions) to pass through while blocking others.

Answer:

Only certain molecules are allowed to pass through.