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Nearly all of the plant tissue called cellulose is made up of cell walls.

Answer;
Cellulose

Nearly all of plant tissue called cellulose is made up of cell walls

Explanation;
Plant cell walls are composed of cellulose, which is a structural carbohydrate and a complex sugar that is used in both protection and structure.
Cellulose is the most abundant polysaccharide on earth. It gives plants cell wall a rigid structure that would resist changes in the outside environment such as osmotic pressures, and pH, and also makes the plant to be upright due to turgidity.