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16 Jul 2018
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One way of studying this is to compare the dna of different species. Remember that most microbes still can"t be cultured. What we can grow, we name according to the standard binomial system. Species: group of strains sharing common features, while differing considerably from other strains. Above the genus level, we use family, order, class, phylum, and finally domain. Soil, air, water, digestive tracts of animals and people. How do we know that archaea is a distinct domain of life. However, genetic analyses show them to be different. They live in some of the most inhospitable places (for humans) on earth. Many live in very challenging environments - called extremophiles. Many other groups of archaeons are now recognized, and many grow in very extreme conditions. They reduce co2 with h2 to produce methane (ch4) and water (h2o) in an unusual reaction. Energy released can be used to fix carbon.

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