Answer:
The reason why it occurs is when the organism doesn't have the desirable traits it needs to survive.
Explanation:
Answer:
A. It uses the animal’s cellular machinery to reproduce inside the animal.
Explanation:
I would go with A because since it is a virus it cannot live outside the body and thus needs to rely on host's cell for metabolism as viruses are not capable of having their own metabolism.
Explanation:
C- both of these terms are interchangeable.
