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Internet Exercises
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For a look at the time periods and the causes of the major extinctions on Earth.
  1. In which Era did multicelled animals undergo both a dramatic explosion in diversity and a mass extinction of around 90% of all marine animal species?
  2. Which Era contains the oldest fossils yet found?


http://www.ucmp.berkeley.edu/help/timeform.html

( http://www.ucmp.berkeley.edu/help/timeform.html )





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