Answer :

Final answer:

Human activities like excess fertilizer use, pesticide disposal, and urbanization contribute to polluted runoff with severe environmental consequences.


Explanation:

Polluted runoff can result from various human activities such as excess fertilizer use in landscapes, improper disposal of pesticides, and urbanization causing impervious surfaces. This runoff, containing contaminants like pathogens, heavy metals, and excess nutrients, can lead to algal blooms, dead zones, and water quality deterioration in natural water bodies.


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