An organism’s first line of defense against attack by an invader such as a virus or bacterium is usually

Question: An organism’s first line of defense against attack by an invader such as a virus or bacterium is usually
[A].

to flee or hide

[B].

its body wall

[C].

a specific immune response

[D].

a nonspecific immune response

Answer: Option B

Explanation:

No answer description available for this question.