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