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Extinction is a natural part of evolution, but it occurs at different scales and intensities. Background extinction refers to the regular, low-rate loss of species due to everyday environmental changes, competition, predation, and disease. These extinctions occur continuously over geological time and affect relatively few species at a time. For example, the gradual disappearance of many marine invertebrate species during the Ordovician period without _______ ___ _________ _________ ____ ___ __________ _____ _____ ____.
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