(A) Oxygen (X)
(B) Carbon (X)
(C) Hydrogen (X)
(D) Nitrogen ()
Answers: The principal constituent of the atmosphere of the Earth is Nitrogen.
(A) Oxygen (X)
(B) Carbon (X)
(C) Hydrogen (X)
(D) Nitrogen ()
Answers: The principal constituent of the atmosphere of the Earth is Nitrogen.
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