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
Convergent evolution in body forms
Saturn and Its Outer, Giant Ring
De novo biosynthesis of the purine ring
Pregnancy cravings
Non-Hormonal Forms of Birth Control
Postural changes with pregnancy in 28 weeks