Which disease is caused by Nickel?
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_________ influences the rate of weathering and humus in soil formation.
Land covers about ______ of the earth's surface.
Who developed the theory of Evolution?
Polycot is a mixture of which among the following?
The largest dolphin species is the orca, also called as ________.
What is formed when Magnesium is burnt?
Depletion of ozone layer causes