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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.
rhythmical wave-like muscular contractions of a duct in order to cause movement of substances...
organelles that only occur in the green parts of plants. They contain the green pigment...
reactions in which smaller simpler molecules joint form larger,complex molecules
an individual who donates an organ for the purpose of transplanting it into another person in an...
the part of the atmosphere that contains the ozone layer and is about 10 km above the Earth's...