What percentage of the urea filtered by the kidneys is excreted in the urine?

a. 10 percent
b. 20 percent
c. 50 percent
d. 75 percent
e. 100 percent


ANSWER: c

Biology & Microbiology

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Synaptic potentials are due to the opening

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Hairs on the leaf on the yellow bush lupine act to ________

a. deter herbivores b. shelter nitrogen-fixing bacteria c. trap moisture d. feed ants that defend the plant

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Usually, an egg cell from a human female contains

a. one X chromosome and one Y chromosome. b. one X chromosome. c. one Y chromosome. d. two X chromosomes. e. two Y chromosomes.

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Which tissues are correctly matched to their progenitor germ layer? (Check all that apply.)  

_____  ectoderm—lining of the digestive tract _____  ectoderm—epidermis _____  endoderm—lining of the respiratory tract _____  endoderm—muscles _____  mesoderm—blood vessels _____  mesoderm—gonads

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