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Question


This chart shows the relative abundance of different groups of echinoderms throughout geologic time. The width of the band indicates the number of species for each group.
The time period shows a mass extinction of animals is

A
End of the Ordovician
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B
End of the Silurian
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C
End of the Devonian
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D
End of the Permian
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E
End of the Triassic
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Solution

The correct option is D End of the Permian
Permian extinction, also called Permian-Triassic extinction or end-Permian extinction, mass extinction event is a series of extinction pulses that contributed to the greatest mass extinction in Earth’s history. Many geologists and paleontologists say that the Permian extinction occurred over the course of 15 million years during the latter part of the Permian Period (299 million to 252 million years ago). The Permian extinction was characterized by the elimination of over 95 percent of marine and 70 percent of terrestrial species. In addition, over half of all taxonomic families present at the time disappeared. This event ranks first in severity of the five major extinction episodes that span geologic time.

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