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Why did the U.S.transportation systems and urban areas attract many human and material resources away from agriculture?
Chorionic Villus
Tiny, finger-like projections found in the placenta, involved in nutrient exchange between mother and fetus.
Placenta
The structure through which the fetus obtains nourishment during pregnancy; the afterbirth.
Needle
A thin, pointed metal instrument used in sewing, embroidery, or medical injections, capable of puncturing or suturing material.
Third Trimester
The final phase of a pregnancy, lasting from weeks 28 to 40, during which significant fetal growth and maturation occur.
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