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Write a short paragraph of about 150-300 words. explain how the physical environment can limit human activities.

Which of the following is not a challenge to instituting sound global environmental policies? a. most changes are inexpensive and easy to implement. b. elected leaders who support unpopular environmental issues often are not re-elected. c. economic considerations outweigh environmental ones in many societies. d. there is no way to enforce international environmental agreements.

Why the moon is not visible from earth during the new moon ?