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The permian-triassic extinction 250 million years ago wiped out about ninety percent of earth's animal species. some scientists are predicting a sixth mass extinction in the future, due to a) acid rain. b) air pollution. c) global warming. d) earthquake activity.
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Which of the following is the most likely outcome of global warming
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What is the compliment dna strand to the following sequence: ttgactaggcta
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Fungi are classified into how many groups? a. 1 group b. 2 groups c. 3 groups d. 4 groups
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The permian-triassic extinction 250 million years ago wiped out about ninety percent of earth's anim...
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