निम्नलिखित में से कौन सी वस्तु पूरी तरह से जैव-निम्नीकरणीय (biodegradable) है?

If sewage water with a very high BOD is directly discharged into a river, the most immediate consequence would be:

Which combination of pollutants is primarily associated with raw, untreated domestic sewage discharge?

What is the primary ecological consequence of thermal pollution caused by discharging heated industrial effluents into natural water bodies?