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A certain element has a half-life of 1,000 years. How much of a sample of this element remains after 2,000 years?
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Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation
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Is there any solid scientific evidence that humans have been cloned?
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A certain element has a half-life of 1,000 years. How much of a sample of this element remains after...
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