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Air pollution is caused by A. the sun. B. heavy rainfall. C. human activities but not natural events. D. natural events and human activities.
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Air pollution is caused by A. the sun. B. heavy rainfall. C. human activities but not natural events. D. natural events and human activities.
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Jun 3, 2020
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Air pollution is caused by A. the sun. B. heavy rainfall. C. human activities but not natural events. D. natural events and human activities.
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Answer:
D . natural events and human activity
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Jun 7, 2020
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