Question

which part of the cell allows some materials in and out?
chromatin
cell membrane
nucleus
mitochondria
rewatch

Explanation:

The cell membrane is a selectively - permeable barrier. It controls the movement of substances into and out of the cell. Chromatin is related to DNA packaging in the nucleus. The nucleus is the control center of the cell containing genetic material. Mitochondria are the power - houses of the cell, involved in energy production.

Answer:

cell membrane