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The general atmospheric conditions behind a cold front is that the air behind the cold front is cool and dry.
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The term that takes into consideration "how humans adapt to and modify the environment is human-environment interaction. Correct answer:C
The term denotes the interactions between the human social system and his environment (the erst of the ecosystem). These interactions include how humans depend on the environment, how humans modify the environment and the way humans adapt to the environment.
Answer: Twice
Explanation: With quadratic functions they are usually represented by parabolas and they can cross the x axis only once or twice :)