The heart begins as two tubes that fuse and begin to pump.
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Q41: The placenta is composed of
A)chorionic villi.
B)uterine tissue.
C)fetal
Q42: During the third and fourth months,
A)lanugo covers
Q43: Maternal and fetal blood supplies mix to
Q44: The first system to be visually evident
Q45: During the fourth and fifth weeks
A)all organ
Q47: The completion of a functioning placenta marks
Q48: Which hormone functions to maintain the corpus
Q49: The gender of the individual is determined
Q50: The umbilical arteries carry
A)waste and carbon dioxide
Q51: During the third week of development,which two
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