At 3½ weeks after fertilization,production of neurons begins deep inside the neural tube at a pace of more than ______ per minute.
A) 250
B) 2,500
C) 25,000
D) 250,000
Correct Answer:
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Q6: An ovum bursts from one of a
Q13: The male produces sperm in the _,
Q15: The period of the embryo lasts from
A)fertilization
Q16: Implantation occurs _ after fertilization.
A)within a few
Q17: The _ becomes the digestive system,lungs,urinary tract,and
Q18: Which of the following parts of a
Q21: An estimated _ percent of American women
Q22: Research suggests that more active fetuses during
Q23: Viability occurs between _ weeks.
A)18 and 21
B)22
Q24: By the middle of the second trimester,the
A)new
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