Twins are caused by two sperm entering the egg at the same time.
Correct Answer:
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Q3: The fetal period lasts
A) from 2 to
Q5: The mother's cells determine the gender of
Q6: Which layer becomes the heart and circulatory
Q9: More than 50% of fertilized eggs fail
Q10: The _period is the first 2 weeks
Q11: Which of the following chromosomal patterns is
Q12: Which layer develops into the nervous system?
A)
Q13: How long is human gestation?
A) 40 weeks
B)
Q23: Fertilization usually occurs in the
A) uterus.
B) cervix.
C)
Q34: Only about _ fertilized eggs develop to
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