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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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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 average adult has about 21 square feet of skin.
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The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.