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Extinction at the end of the Cretaceous

What evidence do we have for the cause of the mass extinction at the end of the Cretaceous?

What were two results of this extinction event?

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At the end of the Cretaceous period there was a massive reduction in species diversity. It was during this period transition that the dinosaurs became extinct. Other species that died out during this transition include pterosaurs, belemnoids, many species of plants ...

Solution Summary

Short paragraph exmaning the evidence for the mass extinction event at the end of the Cretaceous and the results of it. Web references included.