Answer:
Cell Division. Read explanation
Explanation:
It wouldn't be any of the sex cells so that would take out gene activity and offpsring. The only thing that changes the somatic (body) cells would be the slowing of cell division which I would assume is the correct answer.
No system is closed off by it surroundings.
Plates slid past each other
The cell cannot go through mitosis and will not produce a new cell
