Out of every four zygotes, ____ fail(s) to survive.
A) none
B) one
C) two
D) three
Correct Answer:
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Q9: The embryo develops from the embryonic disk,
Q10: The _ is a support structure that
Q11: The _ is a watertight sac in
Q12: The prenatal period lasting from conception to
Q13: Implantation occurs about two _ following conception.
A)hours
B)days
C)weeks
D)months
Q15: The proper place for the blastocyst to
Q16: Identify the correct prenatal sequence of periods,
Q17: _ connects the embryo to the placenta
Q18: The period of the embryo occurs during
Q19: Of the following, the substance that typically
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