The pre-embryonic structure created by cleavage is a ball of cells called a
A) blastocyst.
B) trophoblast.
C) morula.
D) zygote.
Correct Answer:
Verified
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
Q33: What important event does NOT occur in
Q34: From which primary germ layer does the
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
Q39: Embryonic development
A)refers to the first week.
B)refers to
Q40: The amnion
A)is the first site of blood
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