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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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Which of the following is a limitation of a clinical trial? a.)amount of random assignments b.)hospital cost c.)number of test tubes d.)amount of peer review
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What is any method of measuring the age of an object or event in years, such as using atomic half-life?
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Which cell structure directs the cell activities...
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