Goitre is caused by the deficiency of ___________
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In which of the following case, law of demand fails?
Why are the Indian workers less skilled than the workers of western countries?
Which of the following can undergo sublimation?
Blotting paper absorbs ink due to
Land covers about ______ of the earth's surface.
Which of the following states has the maximum area of Mangrove forest?
Recently, scientists have found second Great Spot 24000 km across and 12000 km wide on which planet?