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an atom or a group of atoms that has gained or lost one or more electrons and so has an electric charge.
an atmospheric gas made of three oxygen molecules bonded together (O3).
Linnaeus' two-part name system; the first name of the organism is the genus to which it belongs...
a naturally occurring sequence of organisms from the various trophic levels that feed on each...
invisible, short-wave radiation emitted by the sun, which can cause cancer in humans.