How many major mass extinction periods are listed here? Follow the links from that page to learn more about each period. What caused each, and which major groups of species disappeared from each period?

Geologic History of Earth

The first part of this assignment requires that you consider the history of extinction on our planet.

From the Sam Noble Museum, answer the following questions:

How many major mass extinction periods are listed here? Follow the links from that page to learn more about each period. What caused each, and which major groups of species disappeared from each period?
Conduct a library or web search and find two examples of an extinct species .Explain when each species became extinct and the suspected reason(s) that led to the extinction.

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