Land covers about ______ of the earth's surface.
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The color of human skin depends upon
Which of the following animals do NOT belong to the class of reptiles?
Proteins are polymers formed from
Which among the following is the major cause of acid rain?
Recently, scientists have found second Great Spot 24000 km across and 12000 km wide on which planet?
What is Syzygy?
Which is the coldest planet?