Archaebacteria is the first kingdom of life. Archaebacteria are organized into three phylums. They are found mainly found in extreme habitats where little else can survive. All Archaebacteria that are known are anerobic and obtain their energy from light.
Methanogens: This type of bacteria produces methane. Many such species live in the intestines of animals. They provide essentail nutrients and help breakdown the food in the intestines. The bacteria get a source of energy in return. This is an example of a symbolic relationship. A symbolic relationship is when two organisms work together to survive.
Halophiles: This type of bacteria can only live in bodies of concentrated salt water. An example is the Great Salt Lake in Utah and the Dead Sea in the Middle East.
Thermoacidophiles: Thermoacidophiles is the third phylum. It includes bacteria that is found in hot, acidic waters of sulfur springs. These species can handle temperatures near 80 degrees Celcius and pH levels as low as 2.