Biology for IGCSE & O level - Human Influences On Ecosystems (Section 8 - No. 21)
Which of the following is a result of water pollution from sewage?
Increased levels of dissolved oxygen.
Harm to aquatic life and spread of diseases.
Decreased nutrient levels in the water.
Improved water clarity.
Explanation
Sewage pollution introduces pathogens and depletes oxygen, harming aquatic life.
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