Answer the following question given this paragraph: 

The fluffy white fibers on this plant look like cotton balls because that’s what they are. The plant is a cotton plant, and the fibers are used to make cotton fabric. Cotton fibers consist of one of the most common compounds on Earth: cellulose. Cellulose is a biochemical compound found in all plants. It belongs to the class of biochemical compounds called carbohydrates.


Q: What is one of the most common biochemical compounds on earth and is found in all plants?


A:
cellulose