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The earth's polarity has switched many times through history as evidence by what wh the earth clorets he has switched many times throughout history as evidence by what
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Tropical rain forests support more species per unit area than any other terrestrial ecosystem. what is one way rain forests are important to the health of the biosphere?
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The earth formed roughly 4.5 billion years ago, yet evidence of life dates back to about 3.5 billion years ago. which one is not a possible hypothesis of how life on earth arose?
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Why does dna migrate to the positive electrode?...
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