Cell walls are made of cellulose in cells.

a) animal b) bacteria c) fungal d) plant

D. Plants

Cell walls of plants are made up of cellulose. Cellulose is a type of polysaccharide. It provides rigidity to the plant cell wall. It is a structural carbohydrate that can provide protection to the cell  from the external environment and provides the structural support to the cell. It makes the plant cells of the leaves, and stems strong.

i don't know. if i were you, i would search it up online : d