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 specific pores and transport mechanisms that allow only certain molecules (such as water, small ions, and some small molecules) to pass through based on size, charge, and solubility, while restricting others.

Answer:

Only certain molecules are allowed to pass through.