One of the effects of evolution is that organisms that are poorly adapted die out and become ____. Extinction means the permanent ____ of all members of a ____ from the Earth. There have been five ____ extinction events in Earth’s history when large numbers of species died out within a ____ time. Scientists have evidence that most of these were caused by sudden ____ change, which ____ most of the species that had adapted to one climate, and allowed other species that were better ____ to the new climate to ____ by natural selection

Mass extinction

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