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I think due to gradual increasing genetic errors and increase rate of deleterious mutations each generation becomes less fit than the preceding generation, so in the passing spans of time the genes of a species become less and less incapable of reproduction or species survival. This could account for many of 99%+ of of all species that ever lived that have gone extinct. Of course the dinosaurs became extinct due to a 6 mile diameter meteor striking the Earth. Also changing weather the coming and going of ice ages; as well massive volcano eruptions accounts for extinction of many species for example in Siberia.Are you taking a progressive creationist position, in which your Intelligent Designer is continuously creating species de novo? Or are you claiming that the current 10 million (+/- a lot) species biota is the remnant of a much richer biota of a billion species?
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