Final answer:
The fibers from the structural part of the plant cell wall in veggies and whole grains are primarily made up of cellulose. Cellulose is a fibrous carbohydrate found in all plants and is the main component of plant cell walls.
Step-by-step explanation:
The fibers from the structural part of the plant cell wall in veggies and whole grains are primarily made up of cellulose. Cellulose is a fibrous carbohydrate found in all plants and is the main component of plant cell walls. It is the most abundant carbohydrate in the vegetable kingdom, accounting for over 50% of all the carbon found in plants.