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Which of the following gas makes up 78% of our atmosphere and it is also a part of many molecules essential

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Which of the following gas makes up 78% of our atmosphere and it is also a part of many molecules essential to life like proteins, nuclei acids and some vitamins? 

(A)Nitrogen 

(B) Carbon 

(C) Oxygen 

(D)Argon

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1 Answer

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Correct answer is (A) Nitrogen

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