archaean phylogeny

Archaeans are a group of single-celled organisms that are among the earliest life forms on Earth, existing over 3.5 billion years ago. Their phylogeny, or evolutionary history, shows they are distinct from bacteria and eukaryotes (like plants and animals). Archaeans are divided into several major groups based on genetic and biochemical differences, often thriving in extreme environments such as hot springs or salt lakes. Studying their evolution helps scientists understand the origins of life and how complex organisms evolved from simple ancestors. Overall, archaeans are a fundamental part of Earth's early biosphere and evolutionary history.