Terms used to describe extremophiles include the following: .Alkaliphile:An organism with optimal growth at pH values above 10. .Barophile:An organism that lives optimally at high hydrostatic pressure. .Endolith:An organism that lives in rocks. .Extreme Acidophile:An organism with a pH optimum for growth at, or below,pH 3. .Extremophile:An organism that is isolated from an extreme environment and often requires the extreme condition for growth.Extreme is anthropocentrically derived. .Halophile:An organism requiring at least 0.2M salt for growth. .Hyperthermophile:An organism having a growth temperature optimum of 80 C or higher. .Psychrophile:An organism having a growth temperature optimum of 15 C or lower,and a maximum temperature of 20 C. .Toxitolerant:An organism able to withstand high levels of damaging agents.For example,living in water saturated with benzene,or in the wvater core ofa puclear reactor Terms used to describe extremophiles include the following: •Alkaliphile: An organism with optimal growth at pH values above 10. •Barophile: An organism that lives optimally at high hydrostatic pressure. •Endolith: An organism that lives in rocks. •Extreme Acidophile: An organism with a pH optimum for growth at, or below, pH 3. •Extremophile: An organism that is isolated from an extreme environment and often requires the extreme condition for growth. Extreme is anthropocentrically derived. •Halophile: An organism requiring at least 0.2M salt for growth. •Hyperthermophile: An organism having a growth temperature optimum of 80 ℃ or higher. •Psychrophile: An organism having a growth temperature optimum of 15 ℃ or lower, and a maximum temperature of 20 ℃. •Toxitolerant: An organism able to withstand high levels of damaging agents. For example, living in water saturated with benzene, or in the water-core of a nuclear reactor