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Oxygen only
Oxygen Nitrogen
Hydrogen Carbon
Oxygen Carbon
Ozone hole refers to
Ozone layer above earth’s atmosphere will
Ozone layer in the outer atmosphere helps us in
Ozone saves the biosphere by absorbing high energy radiations called _.
Paleontology is a branch of science that deals with the
Paper is manufactured by
Paper of old books turns to brownish color due to
Paraffin wax used for making candles is obtained from
Particulates (< 1 µm size) remaining suspended in air indefinitely transported by wind currents are called
Pasteurisation is the process in which milk is heated to