Harmful bacteria in potable water make the water
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Which of the following physiological symptoms are signs of stress?
Which of the following is NOT a radioactive element?
The short run marginal cost curve is ____ shaped.
Which one of the following bio reserves of India is not included in the World Network of Biosphere Reserve?
___________ is obtained by evaporation of sea.
June 21 marks the winter solstice in the _________ Hemisphere.
An _______________ is a sudden shaking or trembling of the earth.