Answer: The chemical equation shown represents photosynthesis. Carbon dioxide + A + light ---x---> B + oxygen. What is the role of substance B in photosynthesis? ... It stores chemical energy.
Explanation:
To be frank starch is made up of long chains of glucose. While cell walls are made from cellulose created from photosynthesis. Cellulose is made up of glucose and cell walls are the most abundant carbohydrate.
I don't think doctors are supposed to do that but if they are I'm guessing it's probably to kill a infection of some kind or speed up the healing process