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regions in particular geographical locations with similar climates and vegetation types.
a state in which the body temperature has dropped to dangerously low levels.
a ring of muscle that controls the passage of substances through a tube or body opening.
substance used to test for the presence of starch. It is a mixture of elemental iodine,...
the last part of the mammalian large intestine, which stores faeces until it can be expelled...
a molecule that is formed when oxygen and haemoglobin combine chemically.