Understanding Evolution: your one-stop source for information on evolution
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Found 2 resources for the concept:

imageRadiations and extinctions: Biodiversity through the ages
This excerpted chapter from Carl Zimmer's book, The Tangled Bank, describes the evolutionary processes responsible for large scale patterns in the diversity of life through time. Reprinted with the permission of Roberts and Company Publishers, Inc.
This resource is available from the National Center for Science Education.

Audience: 13-16

Source: Zimmer, Carl

Resource type: Article

imageMass extinction
Usually, extinction operates at a fairly constant rate, culling some species while speciation generates new ones. However, at a few points in life's history the humdrum of regular extinction has been interrupted by mass extinctions. Learn more about these biodiversity crises.

Audience: 13-16

Source: UC Museum of Paleontology

Resource type: Tutorial

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