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Which of the following statements is true? 1. the mantle of the earth is made of solid nickel and iron. 2. the crust of the earth is made of solid nickel and iron. 3. the inner core is made of solid nickel and iron.
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When analyzing tree rings, what do scientists assume a thin ring indicates?
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Why are current extinctions of concern to enviromentalists?
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Given an extracellular cl-concentration of 100 mm and an intracellular cl-concentration of 10 mm, wh...
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