What important event does NOT occur in the second week of development?
A) The heart develops.
B) The embryonic disk is formed.
C) Implantation begins.
D) HCG is secreted to maintain the corpus luteum.
Correct Answer:
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Q28: Which is the last stage in pre-embryonic
Q29: Which of the following is NOT a
Q30: The yolk sac
A)is the first site of
Q31: Identical twins involve _ egg(s)and _ sperm.
A)two;two
B)one;one
C)two;one
D)one;two
Q32: A typical pregnancy test detects the presence
Q34: From which primary germ layer does the
Q35: The pre-embryonic structure created by cleavage is
Q36: From which primary germ layer do both
Q37: Gestation
A)is the time from fertilization to embryo
Q38: The fetus is surrounded by a protective
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