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bekas [8.4K]
2 years ago
6

Which of the following is a flap of tissue in the heart that prevents blood from flowing backwards? A. Atrium B. Pacemaker C. Se

ptum D. Valve
Biology
1 answer:
4vir4ik [10]2 years ago
6 0

Answer:

D. Valve.

Explanation:

These allow blood to flow through without flowing back.

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