What specific molecule is celery mostly made up of?

Celery is primarily composed of water, making up about 95% of its weight. The remaining components include dietary fiber, vitamins (such as vitamin K), and various phytonutrients. The fibrous structure of celery is largely due to cellulose, a polysaccharide that contributes to its crunchy texture. Overall, while water is the predominant molecule, cellulose plays a significant role in its composition.