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.
There are three major known groups of Archaebacteria: methanogens, halophiles, and thermophiles. The methanogens are anaerobic bacteria that produce methane. They are found in sewage treatment plants, bogs, and the intestinal tracts of ruminants.
Archae are microorganisms which explain the limits of life on earth. Archaebacteria are a type of prokaryotic unicellular organism with distinctive cell membranes belong to the kingdom âArchaeâ without a cell nucleus. Archae was first classified as a seperate group of prokaryotes in 1977.It is difficult to classify as they have similarities to normal bacteria and larger eukaryotes.rchaebacteria differ from cell wall and cell membrane as it contains a single layer of phospholipid which allows the archaebacteria to live in very limited resource environments. It acts like a parasite which do not harm or help the host.