árchaea
Archaea are a domain of single-celled microorganisms. These organisms are prokaryotic, meaning they lack a membrane-bound nucleus and other organelles. Like bacteria, archaea are typically a few micrometers in length and possess a cell wall, though their cell wall composition differs significantly from bacteria. Archaea can be found in a wide variety of environments, including extreme conditions such as hot springs, salt lakes, and deep-sea hydrothermal vents. Some archaea are extremophiles, meaning they thrive in environments that are hostile to most other life forms.
Historically, archaea were classified as bacteria, but they are now recognized as a distinct domain of life.
Archaea play important roles in various ecosystems. Some archaea are involved in nutrient cycling, such as