Question

cellulose is the most abundant complex ________ found on the earths surface
lipid
carbohydrate

Explanation:

Cellulose is a polysaccharide, which is a type of carbohydrate. It is a major component of plant cell - walls and is the most abundant organic compound on Earth. Lipids are a different class of biomolecules, such as fats, oils, and phospholipids.

Answer:

carbohydrate