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external opening of the rectum (part of the mammalian digestive tract) through which faeces are expelled.
animals that have a true coelom, which is a fluid-filled body cavity completely lined with...
the liquid produced by the kidneys consisting mainly of water and nitrogenous wastes such as...
regions in particular geographical locations with similar climates and vegetation types.
(also called radioactive dating) a method of measuring the age of fossils based on how much...
non-indigenous species which reproduce and spread more rapidly than indigenous species. This...