____ Is the ____ of life in an area that is determined by ____ ____ is the ____ of genes or ____ characteristic that are present in a population. ____ is the number of ____ species and the relative abundance of each species ____ is the variation of ____ that are present in the biosphere. ____ is the gradual process of species becoming extinct by ____. ____ is an event in which a ____ of all living species become extinct in a relatively ____ period of time.

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