Answer :

Final answer:

A semi-permeable membrane only allows certain molecules to pass through, while a selectively permeable membrane regulates the movement of substances based on specific criteria.

Explanation:

A semi-permeable membrane and a selectively permeable membrane both refer to the cell membrane, which controls the movement of substances in and out of the cell.

A semi-permeable membrane allows only certain molecules or ions to pass through, while blocking others. It has small pores that only allow small molecules to pass through, and larger or charged molecules are unable to cross the membrane.

A selectively permeable membrane, on the other hand, refers to a membrane that can selectively regulate the movement of substances based on specific criteria. It not only allows certain molecules to pass through based on size but also based on chemical properties and charges of the molecules.

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