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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.
the spontaneous movement of molecules, atoms or ions, from an area of higher concentration to an...
part of the skeleton consisting of the skull, vertebral column, sternum and ribs.
a heart chamber that pumps blood from the heart to the body or lungs.
the tube that carries urine from the nephrons to the ureter via the renal pelvis.