______ is the time taken by the earth to return to a given point in its orbit with reference to a fixed star.
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_____________ is the number of deaths in the population during a given period.
One of the best solutions to get rid of nonbiodegradable waste is
Venus is the _______ planet from the Sun.
The Great Smog of 1952 was a severe air-pollution event which affected _______.
Which is the coldest planet?
Which of the following is the largest mammal?
Which of the following are the smaller planets than the size of the Earth?