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Before Baby A was born, she was not sending much blood to her lungs. Instead, the blood passed through the septal defect into the left atrium, which sent it to the left ventricle and to her body. But why didn't the baby die if no blood was going through her lungs?

Answer :

Answer: The baby did not die because, foetus receive their oxygen supply from their mothers placenta and not from breating.

Explanation:

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