1.

Assertion : The left atrium contracts when it is collecting the oxygen rich blood.Reason: Contraction aids in the collection of blood in the same chamber.(a) Both A and R are true and R is the correct explanation of A.(b) Both A and R are true and R is not correct explanation of A.(c) A is true but R is false.(d) A is false but R is true.​

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EXPLANATION:

(B) is CORRECT mark me as brainlist pls



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