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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 osmotic pressure that develops within the cells of a root system that causes the sap to rise...
structure in animal cells thought to form the spindle fibres during cell division.
the nervous system outside the brain and spinal column.
this muscle 'opens' or straightens the joint when it contracts (so the angle between the two...