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animals that lack a cavity between the digestive tract and the outer body wall.
a diploid reproductive stage in the life cycle of many fungi and protists.
a tough substance made from a modified polysaccharide that contains nitrogen. It is the main...
energy resources (coal, crude oil and natural gas) derived from the fossilised remains of plants...
a chemical messenger produced and released by a cell or a gland in one part of the body of the...
an infectious disease caused by the bacterium Mycobacterium tuberculosis thatusually...