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Mats of Archaea on surface of Morning Glory hot spring, Yellowstone Park, WY. Source: 440px-Morning-Glory_Hotspring.jpg (440×328)
Introduction
From the 1860s through the 1970s, the tree of life was grouped into three domains – Plantae, Protista, and Animalia1 (Figure 1).
Fig 1. Simplified phylogenic tree based on Haeckel, 1866.
The Archaea were first discovered in thermal springs where the water temperature was nearly 100 °C (212 °F). Because their general…
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