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How was early Earth's atmosphere different from today's atmosphere?
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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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Which two animals are most closely related? explain.
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How was early Earth's atmosphere different from today's atmosphere?...
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