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There are 60,000 miles of blood vessels in every adult human.
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There are more sensory neurons in the tongue than in any other part of the body.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.