Answer:
I believe it is D
Explanation:
If an antibody is produced for a bacteria, then it would be specific to that bacteria. If the bacteria evolves, an new antibody would have to be produced to mach that new strain of bacteria. I could be wrong, but that is my reasoning. Hope it helps :)
The answer is all of the above. Efferent nerves carry impulses away from the central nervous system, while Afferent nerves carry impulses towards the central nervous system. I hope this helps! :)
Where are the descriptions?