a particular group or type of people or animals living in an area or country​

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population

(a species, family, or other group of animals or plants) having no living members; no longer in existence.

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extinct ​

any of a group of cold-blooded vertebrate animals (as frogs and toads) that have gills and live in water as larvae but breathe air as adults

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amphibian​

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becomeing smaller, fewer, or less; decrease​

decline