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Which of the following best describes a pollutant?
a. a harmful substance that is released to the environment
b. a natural substance that is used by humans or other organisms
c. a substance that is used faster than it can be replaced
d. a substance that is naturally recycled by nature
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Which of the following best describes a pollutant?
a. a harmful substance that is released to...
a. a harmful substance that is released to...
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