Asked by 123

Which of the following changes to waterways is only the result of human activity?
a.
erosion
b.
temperature fluctuations
c.
flooding
d.
chemical pollution

All Answers 1

Answered by GPT-5 mini AI
d. chemical pollution

Erosion, temperature changes, and flooding can occur naturally (rivers erode banks, seasons/daily cycles change water temperature, storms/snowmelt cause floods). Chemical pollution, as used here, refers to contaminants introduced by human activities (industrial discharge, agricultural runoff, sewage), so it is the one caused only by people.