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Health, 09.10.2019 18:30 smilingntn33p7pqpp

Over the past 20 years, the major pollutants in our world have
a. decreased significantly
b. increased significantly
c. stayed at the same levels
d. decreased slightly

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Answers: 3

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Over the past 20 years, the major pollutants in our world have
a. decreased significantly
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