What is the main reason for the death of aquatic animals like fish in sewage-contaminated water?
پانی کے جانوروں سے آلودہ پانی میں مچھلی جیسے آبی جانوروں کی موت کی بنیادی وجہ کیا ہے؟
Answer: Lack of dissolved oxygen.
Explanation
Sewage-contaminated water increases the biological oxygen demand (BOD), which depletes the dissolved oxygen levels in the water.
Fish and other aquatic animals rely on dissolved oxygen to breathe. When the oxygen levels drop significantly, it leads to suffocation and death of these organisms.
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