What causes warm air to rise?
A. It's less dense than cold air
B. It's more dense than cold a...
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Using complete sentences, describe the central economic problem facing all humans. why does this require people to make choices? how can this result in opportunity costs?
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Where the main factor that enabled the growth of cities and civilizations was the existence of
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Geography, 23.06.2019 18:30
Answer this asap. why did the americans go to china? a. trading b. exploration c. land d. live stock
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