Geology 105: History of Life
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Study Guides
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Fossils
Geology & Time
Diversity and Evolution
Extinction
Origins of Earth and Life
Precambrian Life
Early Paleozoic Life
Late Paleozoic Life
Mesozoic Life

Early Paleozoic Life


Updated: 4/14/98

1)What is the duration of the Cambrian Explosion? When did it start? When did it end?
 
 
2)How many major metazoan phyla are known to appear during this time?
 
 
3)List three possible factors in initiating the Cambrian Explosion
 
 
4)What physical changes were occuring to the earth's environment that may have aided the Cambrian Explosion
 
 
5)List three groups that dominate the Cambrian marine faunas.
 
 
6)Diversity in the marine faunas was high or low compared to periods that followed?
 
 
7)Trilobites generally occupied which trophic level?
 
 
8)List four groups that dominate the Paleozoic marine faunas.
 
 
9)Why did diversity in marine metazoans increase after the Cambrian.
 
 
10)List two new trophic levels that may have been established after the Cambrian.