During the period of the embryo,the ectoderm develops and forms the
A) muscles and skeleton.
B) nervous system and skin.
C) digestive system, lungs, and urinary tract.
D) brain and central nervous system.
Correct Answer:
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Q5: The embryonic disk _.
A) becomes the new
Q11: The ovum
A) measures around 1/500 inch.
B) is
Q12: The _ secretes hormones that prepare the
Q13: The yolk sac
A) delivers food and oxygen
Q14: While the senses of sight and sound
Q15: During Michelle's _ month of pregnancy,the eyes,ears,and
Q16: During the period of the embryo,the _
Q17: The age of viability
A) is the point
Q18: The period of the zygote
A) lasts about
Q21: In the eighth month of pregnancy,
A) fetal
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