Question

what is the function of cellulose?
a used by plants to form strong cell walls
b used by some animals to form their external skeleton
c used by animals to store energy
d used by plants to store energy

Explanation:

Cellulose is a major component of plant cell - walls, providing structural support and rigidity. Animals do not use cellulose to form external skeletons (chitin is used for that in some animals), animals do not use it to store energy (glycogen is an energy - storage molecule in animals), and plants store energy in the form of starch, not cellulose.

Answer:

A. Used by plants to form strong cell walls