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In atmosphere, CO2 gas is produced by

(I) Respiration.
(II) Burning of fossil fuels for energy.
(III) Decomposition of CaCO3 for manufacture of cement.
(IV) Volcanic eruption.

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a
(I) and (II)
b
(I), (II) and (III)
c
(I), (II) and (IV)
d
All of these

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detailed solution

Correct option is C

(I) Respiration.(II) Burning of fossil fuels for energy.(IV) Volcanic eruption.

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