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chitin is an example of a carbohydrate
Chitin is found in fungi cell walls.
Some diatoms (a type of protazoa) contain chitin in their cell walls along with inorganic glass-like substances.
Chitin is a polysaccharide. So, it is a polymer of many monosaccharides.
In the case of chitin, the monosaccharide subunit that makes up it polymeric structure is N-acetyl-D-glucosamine.
The outer shells of insects
Chitin is the polysaccharide found in the cell walls of fungi and the exoskeletons of arthropods.