Word: archaea
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...importance of these microbes goes much further. While some extremophiles are bacteria, some are so different from any other single-celled organism that scientists have created a new biological kingdom, called Archaea (from archaic), to accommodate them. As the name suggests, Archaea may be similar to the very first organisms that populated the earth billions of years ago. The implication: life on our planet may first have arisen, not in a warm tidal pool as Darwin and others theorized, but under conditions of sulfurous, searing heat...
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