A is a substance introduced into the environment that has undesired effects or adversely affects the usefulness of a resource.
A
pollutant
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B
nutrient
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C
manure
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Solution
The correct option is A pollutant Pollution is the introduction of harmful materials into the environment. These harmful materials are called pollutants. Pollutants are created by human activity such as waste produced by factories. Pollutants damage the quality of air, water and land.