A change to waterways which is only the result of human activity is: D. chemical pollution.
What is chemical pollution?
Chemical pollution can be defined as the contamination of an environment or waterway, especially through an emission of poisonous, hazardous, and toxic chemical compounds (substances) by humans and various industries.
According to the Environmental Protection Agency (EPA), chemical pollution is a change to waterways which is only caused as a result of human activity.
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