The ectoderm,mesoderm,and endoderm develop during the first two weeks after fertilization.
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Q8: The amnion,chorion,and placenta form during the preimplantation
Q9: Fertilization is the
A) penetration of an ovum
Q10: The second meiotic division in oogenesis is
Q11: Recessive genes express themselves even when they
Q12: Trophoblast cells secrete human chorionic gonadotropin,which has
Q14: How long does the pre-embryonic period last?
A)
Q15: For fertilization to take place,sexual intercourse must
Q16: Fertilization usually takes place in the
A) uterus
B)
Q17: The period of development after birth is
Q18: The embryonic period lasts for about six
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