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substances that have a harmful effect on the environment and also on human health.
(also called autotrophic organisms) organisms that produce their own organic food, mainly...
the structure that separates the right ventricle from the pulmonary artery. It prevents the...
a state in which the body temperature has risen to dangerously high levels.
an atom or a group of atoms that has gained or lost one or more electrons and so has an electric...