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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.
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The horizontal fraction bar was introduced by the Arabs.
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Blood is approximately twice as thick as water because of the cells and other components found in it.