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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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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.