_____________ is the number of deaths in the population during a given period.
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Which of the following is man-made fibre?
The movement inside the Earth's crust is studied by which of the following ?
Earth revolves around Sun. Who was the 1st one to present this theory?
______ is the time taken by the earth to return to a given point in its orbit with reference to a fixed star.
Which one of the following is not a borderline element?
Safety matches contain
Myopia is a defect of eyes which is also known as