| http://www.w3.org/ns/prov#value | - It has happened several times - the slate is effectively wiped clean after huge mass extinctions which decimate ecosystems, such as the one which killed the dinosaurs and allowed mammals to bloom, or indeed the Permian-Triassic extinction which allowed the dinosaurs to come through.Nor do I find this a difficult concept to apply to the Cambrian seas - the oceans are teeming with new experimental l
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