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Author Question: When Cambodians were placed in nonmagnet schools in their district, which of the following is most ... (Read 33 times) |
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There are 20 feet of blood vessels in each square inch of human skin.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.