Which layer gives rise to the heart and circulatory systems
A) ectoderm
B) endoderm
C) mesoderm
D) embryoblast
Correct Answer:
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Q22: More than 50% of fertilized eggs fail
Q23: Fertilization usually occurs in the
A) uterus.
B) cervix.
C)
Q24: The mother's genes predominantly determine the gender
Q25: A man releases about _ sperm in
Q26: From which layer does the nervous system
Q28: Which of the following chromosomal patterns determines
Q29: Biologically, ova and sperm are known as
A)
Q30: The embryoblast transforms into the placenta.
Q31: Twins result from two sperm penetrating an
Q32: _ is the early process of differentiation
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