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What is the main reason for the death of aquatic animals like fish in sewage-contaminated water?

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What is the main reason for the death of aquatic animals like fish in sewage-contaminated water? Answer: Lack of dissolved oxygen.

Question context

This question is part of 🔬 General Science within the broader 🌐 Current Affairs & GK subject and appears in the ETEA Educational Testing and Evaluation Agency preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.