The correct term is extremophile or better yet extremophile. They are the agencies that are adapted to live in very extreme conditions of life--may well be very high or very low temperatures, very high pressures or media rare as supremely saline, acidic and so toxic to other living beings. Other extreme conditions are given for the total absence of water ( conditions anhydrous or desiccation ) which is also amazing. As there are a variety of forms of adaptation, technically given different name ( I give 3 examples ): Halofilos, who live in extremely saline media. Acidophilus, who live in highly acidic media. Xerophiles or Anhidrofilos, those who live in extremely dry media.
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