Oldest Living Organisms

Oldest living organisms are species that have existed for extremely long periods, often millions or even billions of years, with little change. Examples include certain bacteria-like microbes called extremophiles, which thrive in harsh environments, and ancient plants like the bristlecone pines, which can live thousands of years. Some single-celled organisms, such as cyanobacteria, have existed for over two billion years. These organisms have remarkable adaptations that enable them to survive extreme conditions over time, offering a window into the Earth's early history and evolution.