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(geology) Of, or relating to the geologic eon from about 4,031 to 2,500 million years ago; comprises the Eoarchean, Paleoarchean, Mesoarchean and Neoarchean eras; marked by an atmosphere with little oxygen, the formation of the first continents and oceans and the emergence of simple life.
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(ecology) Any of many organisms that live under extreme conditions of temperature, pressure, salinity, etc; many are autotrophs; some are commercially important as a source of enzymes that operate under similar conditions.
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A surname.
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(biology) The creation and development of neurons
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