Extremophiles
Extremophiles are organisms that live in extreme environments. Tardigrades are commonly known as water bears or moss piglets. Water bears are able to live in environments extremely cold environments in which most organisms could not survive. The environments in which they can survive can go down to temperatures as low as −273 °C. Although there is very little fossil evidence left from tardigrades, recent DNA and RNA data shows that they are the sister group to arthropods. They are also considered close relatives to the roundworms because of hox gene data.
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