_____ is the source of energy and materials in human beings.
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Plasma is formed in the stars because of very
Who was the first Indian astronomer to calculate the time taken by earth to orbit the sun?
Helium is added to the oxygen supply of deep sea divers because it is _________
A bomb explodes on the moon. You will hear its sound on earth after _________
The secret Zuma Mission for United States government has been launched on board of SpaceX’s ______ rocket.
Which of the following planets has the highest average density?
Which of the following fuels causes minimum environmental pollution?