What is a semipermeable membrane?

Explanation

### Step-by-Step Solution:

1. **Definition of Semipermeable Membrane**:
A semipermeable membrane is a type of barrier that selectively allows certain substances to pass through while blocking others.

2. **Movement of Solvent Molecules**:
This membrane permits the movement of solvent molecules, primarily water molecules, to pass through it. This means that water can freely move across the membrane.

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