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An opening between the right and left atria that's present in fetal mammals is the A. ductus arteriosus. B. foramen ovale. C. umbilical fistula. D. portosystemic shunt.
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An opening between the right and left atria that's present in fetal mammals is the A. ductus arteriosus. B. foramen ovale. C. umbilical fistula. D. portosystemic shunt.

User W Kristianto
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B) foramen ovale


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User Kebs
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