Answer:
A-Antibodies protect us from getting the exact same virus twice
Explanation:
Answer:
I think it just all exists at once, if it never is created or destroyed. It must have just appeared at the same time at some point. It doesn't exactly come from anywhere, but that's my opinion. There might be another scientific answer out there, but that's what i think. I hope this helps.
Explanation:
Substrate
activate site
product
With an insoluble outer layer which remains in the cell where it is formed until the energy is needed
