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Extinction - the act or process of doing away with
completely; wiping out ; destruction
Doctors are working for the extinction of diseases
Species - any group of plants or animals that can
mate and produce fertile offspring.
The domestic cat is one species of cat.
Endangered species face the most serious threat of
extinction. They require direct human protection for survival.
They must be completely protected from human interference, or the species
will die out.
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