The yolk sac __________.
A) forms during the third trimester of pregnancy
B) is the outer ring of cells that surrounds the blastocyst
C) produces blood cells until the organs are mature enough to take over this function
D) contains one large vein that delivers blood loaded with nutrients and two arteries that remove waste
Question 2
The amniotic fluid __________.
A) delivers food and oxygen to the developing organism
B) helps keep the temperature of the prenatal world constant
C) delivers nutrients and removes waste products
D) produces blood cells until the organs are mature enough to take over this function
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