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keystones Definition

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keystones
noun(key-stone)
the wedge-shaped piece at the crown of an arch that locks the other pieces in place
keystones
noun(key-stone)
something on which associated things depend for support
keystones
noun(key-stone)
a species of plant or animal that produces a major impact (as by predation) on its ecosystem and is considered essential to maintaining optimum ecosystem function or structure

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