The oxygenated and deoxygented blood is ...

The oxygenated and deoxygented blood is separate in the heart of mammals.
Reason (R) : This allows efficient supply of oxygen to all tissues.

Both assertion (A) and (R) are true and reason (R) is the correct explanation of assertion (A).

Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).

Assertion (A) is true but reason (R) is false.

Assertion (A) is false but reason (R) is true.

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