Via the mother's cardiovascular system and the , the respiratory system supplies oxygen to and removes carbon dioxide from the blood of a developing fetus.

The mother's cardiovascular system and the placenta.

Explanation:

Babies receive their oxygen and get rid of the carbon dioxide with the help of both the cardiovascular system of the mother and the placenta. The gases dissolve through the placenta and then gets exchanged in the cardiovascular system of the mother. So the answer is the mother's cardiovascular system and the placenta.

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it would be heredity