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Archaea morphology
Similar to bacteria; archaeons "look" like bacteria
Methanogens
The first group of organisms termed "archaeons"
Halobacterium salinarium
Requires 3.0–5.0 M NaCl (high salt) and is found in the Dead Sea.
Pyrococcus furiosus
Requires 100C(high heat) and ins found in hydrothermal vents

Picrophilus oshimae
An example archaeon with a notable growth requirement of 0.7 pH (very high acidity); found in sulfur-rich volcanic regions.
Methanogenium Frigidum
Require 15C and is usually found in very cold places like Antarctica