Answer the following question given this paragraph: 

Cellulose is the most abundant biochemical compound. It makes up the cell walls of plants and gives support to trunks and stems. Cellulose also provides needed fiber in the human diet. We can’t digest cellulose, but it helps keep food wastes moving through the digestive tract.


Q: What is the most abundant biochemical compound, making up the cell walls of plants?


A:
cellulose