Which layer becomes the heart and circulatory systems?
A) ectoderm
B) endoderm
C) mesoderm
D) embryoblast
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Q1: In the last century global infant mortality
Q2: How long can a sperm survive in
Q3: The fetal period lasts
A) from 2 to
Q5: The mother's cells determine the gender of
Q8: Twins are caused by two sperm entering
Q9: More than 50% of fertilized eggs fail
Q10: The _period is the first 2 weeks
Q11: Which of the following chromosomal patterns is
Q23: Fertilization usually occurs in the
A) uterus.
B) cervix.
C)
Q34: Only about _ fertilized eggs develop to
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