Question

multiple - choice question
what do humans call cellulose and lignin?
tasty goodness
roughage (fiber)
rewatch

Explanation:

Cellulose and lignin are components of plant - cell walls and are known as roughage or fiber in human nutrition. They are indigestible by humans but play important roles in the digestive system. Tasty goodness is not a term related to cellulose and lignin.

Answer:

B. roughage (fiber)