The time from fertilization to birth is the gestation period-the first two months of which is the embryonic period.
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Q18: There is a three-day window during which
Q19: About 8 days after fertilization, the trophoblast
Q20: On the diagram, 3 is pointing to
Q21: Describe the production and functions of the
Q22: Each somite differentiates into three regions: a
Q24: Discuss the formation of both dizygotic (fraternal)
Q25: The number of somites that develop over
Q26: The umbilical cord contains three blood vessels:
Q27: What is the correct order of the
Q28: Arrange the following in the correct order
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