Archaea (/ ɑːrˈkiːə / ⓘ ar-KEE-ə) is a domain of organisms. Traditionally, Archaea only included its prokaryotic members, but this has since been found to be paraphyletic, as eukaryotes are now known to have evolved from archaea.

Mar 27, 2025 · Archaea are microorganisms that define the limits of life on Earth. They were originally discovered and described in extreme environments, such as hydrothermal vents and terrestrial hot springs. They were also found in a diverse range of highly saline, acidic, and anaerobic environments.

Jan 24, 2022 · Archaea are single-celled organisms that are similar to bacteria, though they have different characteristics. They can be spherical, rod-shaped, spiral, or rectangular. Beyond the human body,...

Oct 19, 2023 · Archaea, formerly known as ‘archaebacteria,’ are a group of single-celled, prokaryotic organisms belonging to the domain Archaea. Apart from Archaea, Bacteria and …

Dec 16, 2022 · Archaea are a domain of single-celled microorganisms. They are extremophiles, capable of surviving in extreme environments where no other organisms would survive. The …

Oct 8, 2023 · Archaea is a domain of life, together with Bacteria and Eukarya, containing single-celled prokaryotes other than bacteria. They are the oldest life-form known to exist.

Archaea are a group of micro-organisms that are similar to, but evolutionarily distinct from bacteria. Like bacteria they are single celled organisms which lack a membrane bound nucleus, but they differ in a number of fundamental traits, such as the composition of their cell walls and the functions which happen inside their cells.

14 hours ago · Archaea—one of the three primary domains of life alongside bacteria and eukaryotes—are often overlooked and sometimes mistaken for bacteria due to their single-celled nature and lack of a ...

Archaea are unicellular prokaryotes that comprise the domain of the same name, Archaea. These microorganisms physically resemble the bacteria but are genetically distinct from the latter.

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.