The celery stalk depicted above (Apium graveolens) is unique in the pant world due to the fact that it is comprised almost entirely of water and cellulose. Cellulose is a chain of beta glucose where the monomers in an inverted pattern. This makes it so that humans cannot digest it and animals who can must either chew it a lot, have a long cecum to digest it, have special bacteria to digest it for them, or they must re-consume their feces and digest it again after expulsion (coprophagia). All plants have cell walls made of cellulose and it comprises 90% of cotton and approximately 45% of wood.
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