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Problem 8 - Olympiad
A lake experiences a sharp increase in algal blooms after untreated sewage discharge. What is the primary ecological consequence?
A. A) Reduction in dissolved oxygen levels
B. B) Increase in fish reproduction
C. C) Formation of ozone layer
D. D) Enhanced biodiversity
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Correct: A
Algal blooms consume oxygen during respiration and decomposition, leading to hypoxic conditions that harm aquatic life.