During treatment of water to make it potable, about 90% of the microbes are removed
A) by preliminary fermentation.
B) in the sedimentation step.
C) by treatment with biosensors.
D) by treatment with chlorine or ozone.
E) in the filtration step.
E
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After his return to England, Darwin pondered which of the following questions most heavily?
a. What could explain the great numbers and variety of species? b. Does the fossil evidence support uniformitarianism? c. Are the extinct and living armadillos the same species? d. Did Galápagos mockinbirds have a common mainland ancestor? e. Will natural selection work in England?
The two most important factors that determine an area's climate are:a
temperature and wind. b. humidity and temperature. c. temperature and precipitation. d. cloud cover and wind. e. humidity and fog.
The proximal convoluted tubule
A. reabsorbs most of the valuable materials that leave the glomerulus and enters the nephron. B. secretes ions into the nephron. C. simply conducts fluid to the loop of Henle. D. reabsorbs fats and proteins.
After the replication of a cell's DNA, there are twice as many centromeres as there are chromatids.
a. true b. false