गंगा जैसी नदियों में मूर्ति विसर्जन जैसी धार्मिक प्रथाओं से जुड़ी प्रमुख पर्यावरणीय चिंता क्या है?

Which of the following best defines non-point source water pollution?

What is the primary characteristic that distinguishes anthropogenic eutrophication from natural eutrophication in water bodies?

What specific environmental state is created when severe dissolved oxygen depletion occurs during eutrophication, ultimately leading to the death of aquatic organisms?