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What helps to avoid mixing up of blood rich in oxygen with blood rich in carbon dioxide in the heart?a)Heart has two chambersb)Heart has four chambersc)Heart has three chambersd)Heart has five chambersCorrect answer is option 'B'. Can you explain this answer? for Grade 7 2025 is part of Grade 7 preparation. The Question and answers have been prepared according to the Grade 7 exam syllabus. Information about What helps to avoid mixing up of blood rich in oxygen with blood rich in carbon dioxide in the heart?a)Heart has two chambersb)Heart has four chambersc)Heart has three chambersd)Heart has five chambersCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Grade 7 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What helps to avoid mixing up of blood rich in oxygen with blood rich in carbon dioxide in the heart?a)Heart has two chambersb)Heart has four chambersc)Heart has three chambersd)Heart has five chambersCorrect answer is option 'B'. Can you explain this answer?.

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