What are extremophiles? EXTREMOPHILES are organisms that require extreme environments for growth. Extremophiles are organisms that are "fond of"or "love"(- phile)environments including high temperature,pH, pressure and salt concentration,or low temperature,pH, nutrient concentration,or water availability. Extremophiles are also organisms that can tolerate extreme conditions including high levels of radiation or toxic compounds,or those living in conditions that we consider unusual Most extremophiles are microorganisms that thrive under conditions that from a human perspective are clearly extremeWhat are extremophiles? • EXTREMOPHILES are organisms that require extreme environments for growth. • Extremophiles are organisms that are "fond of" or "love" (- phile) environments including high temperature, pH, pressure and salt concentration, or low temperature, pH, nutrient concentration, or water availability. • Extremophiles are also organisms that can tolerate extreme conditions including high levels of radiation or toxic compounds, or those living in conditions that we consider unusual. • Most extremophiles are microorganisms that thrive under conditions that from a human perspective are clearly extreme