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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.
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There are 20 feet of blood vessels in each square inch of human skin.
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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.
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Illicit drug use costs the United States approximately $181 billion every year.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.