The cell membrane allows things in and out of the cell.
Isotopes are elements with same atomic number Z= number of protons but different mass number A, where A= Z+N, N= number of neutrons which is variable. As for radioisotopes, I’ve never heard of them before !
I think the answer is photosystem
Answer:
it increases for a while and then decreases
here is the answer of this qquestion
