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small tube that carries air inside of the lungs of vertebrates.
substances that have a harmful effect on the environment and also on human health.
a measure of acidity or alkalinity.
valve between the right atrium and the right ventricle.
teeth found at the back of the mouth just in front of the molars in the mammalian jaw, used for...
(also called caustic soda) a white solid, available in pellets, flakes or granules, with the...