The outer layer of the skin covering the exterior body surface<span> of vertebrates ... the primary tissue of higher plants composed of </span>thin<span>-walled </span>cells<span> that remain capable of ... a swelling on a plant stem consisting of overlapping immature </span>leaves<span> or petals ... Older xylem </span>near<span> the center of a woody stem that no longer conducts water.</span>
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 :)
I think it’s either the first or last one
