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

Smog
Green house effect
None of these
Eutrophication

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Chemistry
The mass number of a nucleus is

the sum of the number of protons and neutrons present in the nucleus
a fraction
always less than its atomic number
always more than the atomic weight

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