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1) Rainwater harvesting is necessary for increasing the volume of ground water. Here the rain water is collected through the construction of wells, khet talavadi, etc. This results in the accumulation of Water in the sub-strata and the ground water level is raised.
2) fish will not live easily in dirty water because the fish can survive only on oxygen present in water (H2O) and in dirty water fish can not take the oxygen easily.
3) air was contains of mixture of many gases. oxygen is one of the gas present in air, and oxygen is life sustainable gas, it is very necessary for living being
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