It only allows certain things through, such as water. One way to remember it is to think about how you wouldn’t eat just anything, and the cell doesn’t let just anything in. I hope this helps
The answer to your question is Avoid UV radiation 6y wearing sunscreen
Answer:
Osmosis:The movement of solute across a semi-permeable membrane
Cell membrane:It is a semi-permeable allowing the movement of water and nutrients to move in and out of the cell.