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made up of a number of layers.
the part of the atmosphere that contains the ozone layer and is about 10 km above the Earth's...
endocrine gland situated on top of each kidney, which produces hormones in response to stresses...
the muscular tube of the mammalian digestive tract that links the mouth to the stomach.
(also called caustic soda) a white solid, available in pellets, flakes or granules, with the...
an infectious disease that is widespread in tropical and subtropical parts of the world and is...