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Select the correct answer. During which stage of fetal development do the heart and lungs of a fetus become fully developed and functional? A. first trimester B. second trimester C. fertilization D. third
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Select the correct answer. During which stage of fetal development do the heart and lungs of a fetus become fully developed and functional? A. first trimester B. second trimester C. fertilization D. third trimester

User Siddhusingh
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Answer: B the second trimester

User John De Santiago
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