C. Because pure water might cause the patients blood cells to burst- because water will move in to the cells down the concentration gradient by osmosis
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<h2>
<em><u>Climate is an important environmental influence on ecosystems. Changing climate affects ecosystems in a variety of ways. For instance, warming may force species to migrate to higher latitudes or higher elevations where temperatures are more conducive to their survival.</u></em></h2>
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Answer: D. Convection
Explanation: As water's temperature increases in the presence of a heat source, it will become less dense and rise. As it moves up and away from the heat source, it cools and becomes denser and sinks.