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| Over the course of the Earth’s history extinction of species has been the norm. Go to
http://www.ucmp.berkeley.edu/help/timeform.html, for a look at the time periods and the causes of the major extinctions on Earth. a. 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? b. 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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