Answer:
There is no mixing of oxygen-rich and oxygen-poor blood.
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The right atrium and right ventricle of the human heart pump oxygen-poor blood to the lungs and the left atrium receives oxygen-rich blood. They never mix.
Father: XY
Mother: XX’
The father is normal, while the mother is a carrier.
Answer: radiation i think
I would say B because A doesn’t have a ring to it.