Question

semipermeable means... everything can get through. nothing can get through. only water can get through. only some things can get through.

Explanation:

A semi - permeable membrane allows only certain substances (usually small molecules like water, ions) to pass through while restricting the passage of larger molecules.

• Option 1: If everything could get through, it would be a completely permeable membrane, not semi - permeable.
• Option 2: If nothing could get through, it would be an impermeable membrane.
• Option 3: It's not just water. For example, in a cell membrane (a semi - permeable membrane in biological systems), some ions can also pass through under certain conditions.
• Option 4: This is the correct definition as it implies selectivity in what can pass through.

Answer:

only some things can get through.