The term used to describe how the cell selects what materials enter and leave is selective permeability.

Here's why:

* Permeability refers to the ability of a membrane to allow substances to pass through it.

* Selective means that the membrane chooses which substances can pass through.

The cell membrane is a selectively permeable barrier that controls the movement of substances into and out of the cell. This selectivity is crucial for maintaining the cell's internal environment and allowing it to function properly.