Chemistry
When a nutrient like fertilizer is present in large quantities in a water bodies, plants grow and decay in large numbers because of suffocating of pond that does not leave enough oxygen needed to support life. This type of pollution is called

Green house effect
Eutrophication
None of these
Smog

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Chemistry
Atoms of different elements have

Same number of electrons and neutrons
Same atomic number and same electronic configuration
Different atomic number and same eletronic configu-ration
Different atomic number and different number of valence electrons

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