The technologies involved in communication tend to be complex. You certainly don't need to understand them for your ICT course. However, there are aspects of digital communications that you needs to be aware of. These relate primarily to the two types of network and the ways of connecting to the internet.
Archaeans include inhabitants of some of the most extreme environments on the planet. Some live near rift vents in the deep sea at temperatures well over 100 degrees Centigrade. Others live in hot springs (such as the ones pictured above), or in extremely alkaline or acid waters.
Archaebacteria belong to the Domain Archaea and are single-celled organisms that tend to live in extreme environments, like hot springs or in high-salt regions. In fact, these organisms boldly go where others cannot! They have been called extremophiles, which means lover of extremes. Methanogens: These archaea release methane gas, hence the name. 2  These extremophiles are found in anaerobic habitats, or places without oxygen. 3  They can be found in your intestines as well as the guts of cows.