Earth
What is it called when a plant produces two kinds of sex cells?
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What is the imaginary line that runs around the Earth halfway between the poles called?
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Which of these types of energy is cleanest and causes the least pollution?
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What kind of scientist studies weather and climate?
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What is a comparison of air water vapor to amounts of vapor at a given temperature called?
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On October 11, 1999 the world population hit a milestone of how many?
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