Chapter 9: Class 9 Biology Exam Tests
Class 9 Biology MCQs - Chapter 9
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Considering the cardiac cycle, the sound "dub" is produced when the
The person having both antigens A and B on the surface of RBCs has blood group
The antigens that differentiate one blood group from another are
The time for atrial systole in one heartbeat is
The places in the human body where the artery is closed to the skin include
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