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Listen Number of families of marine animals 900 600 300 Cambrian explosion 600 PALEOZOIC ERA...

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Listen Number of families of marine animals 900 600 300 Cambrian explosion 600 PALEOZOIC ERA Ordovician Devonian extinction extinction MESOZOIC ERA Triassic extinction Permian extinction 400 200 Geologic time 106 years before present CENOZOIC ERA illicer Cretaceous extinction 0 The figure represents the fossil record of marine organisms that depicts long term changes in animal diversity Choose which answers below accurately describe the figure above The overall number of marine families has increased to the present This figure illustrates polymorphism within a species of marine organisms The most disastrous extinction occurred approximately 200 million years ago mya The Cambrian explosion is when most families of marine organisms arose The sharp drops on the figure indicate punctuated equilibrium which explains change in speciation and extinction over millions of years The sharp drops on the figure indicate episodic mass extinctions which explains

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