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The aortic valve is the final door blood goes through as it exits the heart. Obstruction of that valve is called stenosis and leakage of the valve as it closes after each heartbeat is called regurgitation
Answer:
Protista, Fungi, Plantae, and Animalia
Explanation:
Answer:
lack of genetic variation
Explanation:
If you have multiple of the same people there wont be much variation
