The chemical equation shown represents photosynthesis. a plus water plus light with a right-pointing arrow towards b plus oxygen. the arrow has an x above it. what is the role of substance a in photosynthesis? it traps light energy from the atmosphere. it combines with water to form glucose. it cools the atmosphere by changing into vapor. it changes into hydrogen in the presence of light.

It combines with water to form glucose.

6CO2 + 6H2O + light energy = C6H12O6 + 6O2.

The correct answer is it combines with water to form glucose.

Photosynthesis is the process by which green plants make food by the help  of sunlight and chlorophyll.

The food produced here is in the form of glucose.

The carbon dioxide, water and chlorophyll combines in the pressence of sunlight and forms glucose and oxygen which is the food for the plants.

bal is blood alcohol level. bac will normally be higher in a person with more body fat. so the answer to your question would be, as body fat decreases, the increasing rate of bal decreases.