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Casts and mold are a type of preservation where the original material decays, leaving a mold in surrounding rock that can be filled with another sediment a. true b. false
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Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above
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3. How many elements were know at this time? 4. How did Robert Bunsen and Gustav Kirchhoff perfect t...
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