Question

what does selective
a allows all substances pass through freely
b moves molecules using atp energy.
c allows some substances to pass through but not others.
d blocks everything from passing through.

Explanation:

A selectively permeable membrane is one that allows some substances to pass through while blocking others. This is a key characteristic of cell membranes, which regulate the movement of molecules in and out of the cell. Option A is incorrect because a selectively permeable membrane does not allow all substances to pass through freely. Option B describes active transport, which is a specific type of movement that requires ATP energy. Option D is incorrect because a selectively permeable membrane does not block everything from passing through.

Answer:

C. Allows some substances to pass through but not others.