Answer:
The answer is A.
Explanation:
The arrows represents being eaten by other organisms.
(Correct me if I am wrong)
Answer:
Antibodies develop to fight off the virus.
Explanation:
Antibodies develop while you get a virus, which helps fight off the virus and protect you from getting it again.
C. <span> prokaryotes convert nitrogen-containing molecules into forms that can't be used by other organisms.</span>