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Insects.
Exoskeletons are mainly chitin, a carbohydrate.
chitin
cellulose
cellulose
chitin
Chitin is a structural carbohydrate that forms their exoskeleton
Chitin is a structural carbohydrate that forms their exoskeleton
A chitin that makes up the exoskeleton of insects is not made out of a polymer of amino acids. Chitin is a nitrogen that contains polysaccharide.
Cellulose makes up the cell wall in plants.
cellulose
exoskeleton