Archaea (domain)

Scope note: Members of a group of bacteria that differ in certain morphological, physiological, and genetic features from the eubacteria. One of the three major divisions of living organisms. They do have some features in common with the eubacteria, suggesting to some researchers that the two groups shared a common ancestor early in their evolutionary history. The two groups of bacteria are as different from each other as they are from eukaryotes (plants and animals). Archaea are microbes and most live in extreme environments requiring excesses of heat or salt for survival, and neither sunlight nor oxygen. They absorb carbon dioxide, nitrogen, or hydrogen sulfide and give off methane gas as a waste product the same way humans breathe in oxygen and breathe out carbon dioxide. Archaea could survive in environments such as those on Venus and in the past on Jupiter, Mars, and Saturn, and Jupiter's moon, Io.

300265676

Tesaurus d'Art i Arquitectura