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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.