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Biology, 07.12.2021 23:10 7obadiah

Which definition is the best for “semipermeable membrane”? It is a barrier that prevents materials from moving from one side to the other.
It is a barrier that allows materials to move freely from one side to the other.
It is a barrier with tiny openings that let some, but not all, materials pass through.
It is a barrier that helps materials move from one side to the other.

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