Editing Extremophile (section)

===Polyextremophiles===
There are many classes of extremophiles that range all around the globe; each corresponding to the way its environmental niche differs from mesophilic conditions.  These classifications are not exclusive. Many extremophiles fall under multiple categories and are classified as '''polyextremophiles'''. For example, organisms living inside hot rocks deep under Earth's surface are thermophilic and piezophilic such as ''Thermococcus barophilus''.<ref>{{Cite journal |vauthors=Marteinsson VT, Birrien JL, Reysenbach AL, Vernet M, Marie D, Gambacorta A, Messner P, Sleytr UB, Prieur D |date=April 1999 |title=Thermococcus barophilus sp. nov., a new barophilic and hyperthermophilic archaeon isolated under high hydrostatic pressure from a deep-sea hydrothermal vent |journal=International Journal of Systematic Bacteriology |volume=49 Pt 2 |issue=2 |pages=351–59 |doi=10.1099/00207713-49-2-351 |pmid=10319455 |doi-access=free}}</ref> A polyextremophile living at the summit of a mountain in the [[Atacama Desert]] might be a [[radioresistant]] [[xerophile]], a [[psychrophile]], and an [[oligotroph]]. Polyextremophiles are well known for their ability to tolerate both high and low [[pH]] levels.<ref>{{Cite journal |display-authors=6 |vauthors=Yadav AN, Verma P, Kumar M, Pal KK, Dey R, Gupta A, Padaria JC, Gujar GT, Kumar S, Suman A, Prasanna R |date=2014-05-31 |title=Diversity and phylogenetic profiling of niche-specific Bacilli from extreme environments of India |journal=Annals of Microbiology |volume=65 |issue=2 |pages=611–29 |doi=10.1007/s13213-014-0897-9 |s2cid=2369215|doi-access=free }}</ref> Note that "tolerant" or "resistant" organisms are not necessarily extremophiles: tolerant or resistant organisms may ''survive despite harsh conditions'' instead of ''thriving in harsh conditions''. For example, the [[tardigrade]] (''Tardigrada'' spp.), despite being highly resistant to many stresses, is not an extremophile properly speaking.<ref name="LauraRobertson">{{cite web |url=https://frontlinegenomics.com/everything-you-need-and-want-to-know-about-tardigrades/|title=Everything you need (and want) to know about tardigrades|publisher=Front Line Genomics|access-date=17 May 2025|vauthors = Robertson L |date=October 2022}}</ref>