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No one knows exactly how many animals have gone extinct, because the fossil records only are the preserved remains of a mere fraction of the animals that ever lived, because the formation of fossils has to occur in such specific conditions. However, scientists where able to estimate that about 99.9% of all of the animals that have ever lived on this planet have gone extinct. False most of the animals that had lived on this Earth or still do are becoming or became exticnt, many reasons and it is at least 85% of the animals that are exticnt. Mostly cased by polution, global warming, abuse, the ozone layer, fossil fuel, and CFC molecules.)

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16y ago

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