1.

Statement I : Rate of breathing is regulated is regulated by respiratory centres present in the medulla oblongata. Statement 2 , Changes in the `CO_(2)` level of the arterial blood control the rate of breathing.A. If both A and R are true and R is the correct explanation of A.B. If both A and R are true but R is not the correct explanation of AC. if A is true but R is false.D. If both A and R are false.

Answer» Correct Answer - B


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