Importance of Water App Download | Class 7 Science Quiz PDF e-Book
Class 7 Science Cerification Guide: Practice Test 19 (Chapter 13)
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The worst disease of the water-related diseases is
Fertilizers that are washed away into rivers help in formation of
The mortality rate in children due to polluted water or lack of water is
The spread of a disease through drinking water that is caused by water parasites, is known as
A larvae of a worm can get into the human body even by
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