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>
Boron has a smaller radius and the protons in carbon exert a greater pull
B. Ability to move. Because all the other choices apply to all living things, but B doesn't apply to plants which are living things.
During that process light energy becomes food for plants
