Answer:
C. amount of peer review.
Explanation:
(1) normally harmless cat antigens stimulated
<span>the immune system</span>
Athletics would be the easiest choice here
Sports are an active that takes up a lot of different organ systems. When running I use my muscular system and cardiovascular system the most. The cardiovascular system directly controls running because it helps prevent me from getting tired and worn out faster.
Hope this helps :)
