The human placenta is formed by the interaction of uterine tissue and what extraembryonic tissue?
A. amnion
B. embrion
C. chorion
D. yolk sac
E. allantois
C. chorion
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Trophic-level transfer efficiency averages about
A. 1%. B. 25%. C. 33%. D. 10%. E. 0.1%.
Water and small solutes are filtered under pressure out of the blood plasma into nephrons through the porous walls of _________, tufts of capillaries in the renal cortex.
A. Loops of Henle B. collecting ducts C. juxtaglomerular apparati D. vasa rectae E. glomeruli
In summer, a __________ prevents upper and lower waters from mixing. Fill in the blank(s) with the appropriate word(s)
The dilemma of whether proteins or nucleic acids directed the first synthesis of the other is avoided by the
A. protein-first hypothesis. B. RNA-first hypothesis. C. clay-catalyst hypothesis.