Answer:
An extremophile
Explanation:
An extremophile is an organism that thrives in extreme environments. Extremophiles are organisms that live in "extreme environments," under high pressure and temperature. ... Since they live in “extreme environments” (under high pressure and temperature), they can tell us under which range of conditions life is possible.
Alleles can disappear from a population through natural selection. This relates to the most fit phenotype because the breed with the desirable trait, or the most fit, will live and produce off spring. Eventually the less desirable trait and its corresponding allele will disappear after multiple generations pass. If the environment does not change alleles of non desirable traits will disappear. <span />
