Answer:
D.
Explanation:
A. just isn't true. B. isn't true either because, like bacteria, we are adapting to their changes. C. isn't right either because some bacteria helps us survive. D. is the only true statement.
Explanation:
-infectious
-microscopic
-specific to their host
-can't reproduce on their own (this is why they are not considered alive)
-no organells or membranes. just a protein coat and genetic material
-3 basic shapes: helical , polyhedral , and comples
Your answer is D
I hope this helps out!
Depend on what you mean by what kind of competition, if you talk about competition for food, some bird population may be getting smaller and have a hard time to reproduce because they can't get enough food for themselves.
