Many Archaea that have been characterized typically inhabit extreme environments that are otherwise devoid of life. These include conditions of high salinity, heat, acidity, and alkalinity.
■ Why do seawater ponds sometimes turn pink as the water evaporates?
■ At which relative depth in a sulfur hot spring would a sulfur reducer likely be found? How about a sulfur oxidizer?
■ What characteristic of the methanogens makes it logical to discuss them with the Bacteria rather than the other Archaea?
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