the hard, variously colored, calcareous skeleton secreted by certain marine polyps. 2. such skeletons collectively, forming reefs, islands, etc. 3. the solitary or colonial polyp that secretes this calcareous skeleton.
Ancient methanogens are the source of natural gas. Halophiles are bacteria that thrive in high salt concentrations such as those found in salt lakes or pools of sea water. Thermophiles are the heat-loving bacteria found near hydrothermal vents and hot springs.
The eubacteria and archaebacteria are probably the least known of this categorization. Eubacteria and archaebacteria are two very different kinds of bacteria, each with their own identities and use in our daily lives. Archaebacteria are one of the oldest of organisms found on planet earth.