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 has properties that allow only specific molecules or ions to cross it based on size, charge, or solubility. This helps in maintaining the cell's internal environment by controlling the movement of substances in and out of the cell.

Answer:

Only certain molecules are allowed to pass through.