Which of the choices can best fill in the boxes I and II given below? – McqOptions

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1.	Which of the choices can best fill in the boxes I and II given below?
A.	l-carbon dioxide, II-oxygen
B.	l-oxygen, II-respiration
C.	l-respiration, II-carbon dioxide
D.	l-respiration, II-oxygen
Answer» D. l-respiration, II-oxygen

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