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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.
this muscle 'closes' or bends the joint when it contracts (so the angle between the bones...
double-membraned, pigmented, cytoplasmic organelles found in plant cells. The organelles have...
bitter yellow or green alkaline fluid secreted by the liver, which serves to emulsify fats
a connected network of vessels and glands, which carry lymph throughout the body.