a. decreased significantly
![subject](/tpl/images/cats/health.png)
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
![ansver](/tpl/images/cats/User.png)
Answers: 3
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Over the past 20 years, the major pollutants in our world have
a. decreased significantly
a. decreased significantly
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