Discussion
Biodegradable pollutant is
Answer: D
The biodegradable pollutant is sewage.
Sewage consists largely of organic matter that bacteria and other decomposers break down into simple, harmless substances, though in large amounts it depletes oxygen in water.
DDT is a persistent pesticide that resists breakdown and accumulates along food chains; plastic lasts for centuries; and asbestos is a mineral fibre that does not decompose. All three are non-biodegradable.
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