Which of the following changes to waterways is only the result of human activity?

a.
erosion
b.
temperature fluctuations
c.
flooding
d.
chemical pollution


Please select the best answer from the choices provided

A
B
C
D

1 answer

D. Chemical pollution is the only change to waterways that is solely the result of human activity. Erosion, temperature fluctuations, and flooding can all occur naturally without human intervention.
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