Pollution Sewage as Cause MCQ App Download - IGCSE O Level Biology PDF e-Book
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Profuse growth of algae occurs due to
Sulfur dioxide (SO2) may be reduced in air, if
Nitrates (NO3-1) and phosphates (PO4-3) reach underground water with
Loss of control of hand and feet occurs due to
If lead accumulation occurs for long in the body, the outcomes may include
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