In ecology, what biological phenomenon occurs when agricultural runoff containing excess nitrates and phosphates causes algal blooms and deep water deoxygenation?
Answer and explanation
Correct answer: C. Eutrophication
- Step 1: Nutrient enrichment (eutrophication) triggers explosive algal proliferation; subsequent bacterial decomposition of dead algae depletes dissolved oxygen. Answer: Eutrophication. Why not the others: Biomagnification refers to increasing toxin concentration up food chains.
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