Answer:
I think its c Scientists cannot determine how it changes.
d). It increases over time.
Yes. Indirectly, through plants. Without plants using photosynthesis, and therefore, creating oxygen, we wouldn't have enough breathable air.
You can't use it because the living cells won't be able to handle the high vacuum conditions.
Hope this helped ;)
To be sure, all cells have a plasma, membrane, ribosomes, cytoplasm, and DNA.
