Please find....Our body works within the pH range of 7.0 to 7.8. Living organisms can

survive only in a narrow range of pH change. When pH of rain water is

less than 5.6, it is called acid rain. When acid rain flows into the rivers, it

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lowers the pH of the river water. The survival of aquatic life in such rivers

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becomes difficult.

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pH in our digestive system:

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It is very interesting to note that our stomach produces hydrochloric

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