Which layer develops into the nervous system?
A) ectoderm
B) endoderm
C) nesoderm
D) embryoblast
Correct Answer:
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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
Q13: How long is human gestation?
A) 40 weeks
B)
Q21: Cell division in gametes is achieved by
A)
Q23: Fertilization usually occurs in the
A) uterus.
B) cervix.
C)
Q25: A man releases about _ sperm in
Q29: Biologically, ova and sperm are known as
A)
Q37: Of the sperm released during intercourse, about
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