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Answer : 4 In the adult heart, blood in the right chambers of the heart cannot enter the left chambers without passing through the lungs. Explanation : Answer: D) In the adult heart, blood in the right chambers of the heart cannot enter the left chambers without passing through the lungs. Explanation: In the adult heart, blood in the right chambers of the heart cannot enter the left chambers without passing through the lungs is correct regarding mammalian heart.

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