Biology

The correct answer is: C.Student 3: Cell membranes regulate which substances can enter and exit the cell.

Here’s why:

1.Selective permeability means that the cell membrane allows certain substances to pass through while blocking others. The cell membrane is not a barrier that prevents all materials from entering (as Student 1 suggests) nor is it only for structural support (as Student 2 suggests). It regulates what enters and exits the cell, based on factors such as size, charge, and whether transport proteins are present ...