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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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There are more sensory neurons in the tongue than in any other part of the body.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.