It would be D because would be small and you wouldn't feel it. For answer A, the scientist could feel it. For answer B, you can kind of feel it or feel it. For C, It can definitely feel it. So the answer would be d.
i think that the body does its just that the antibodies arent strong enough to combat the virus completely
The control (choice A) I believe :)
Answer:
Tempature and Ph affect enzyme activity the most
