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a tough substance made from a modified polysaccharide that contains nitrogen. It is the main component of the exoskeletons of arthropods, the cell walls of fungi, the radula's of molluscs and the beaks of cephalopods.
a relationship between two different organisms, of different species, from which at least one of...
a state in which the body has become dependent on a chemical substance in order to function.
the hormone produced by the beta cells of the Islets of Langerhans in the pancreas, which...