How do bicarbonates influence biotic factors?
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a. they increase the acidity of water.
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b. they buffer cells from extremes of ph.
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c. they increase the salinity of water.
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d. they are important for plant growth.

Under the soviet system, the government a. controlled all forms of communication. b. allowed newspapers to print whatever they wanted. c. controlled editorials but not the reporting of news. d. encouraged access to a wide variety of news sources. select the best answer from the choices provided a b c d