single-celled organisms

Single-celled organisms, also called unicellular organisms, are living things made up of just one cell. Despite their simplicity, they can carry out all necessary life functions like growth, reproduction, and response to their environment independently. Examples include bacteria, archaea, and some algae and protozoa. These organisms are incredibly diverse and can live in nearly every environment on Earth, from deep oceans to soil. Their single cell functions as a complete organism, performing tasks such as getting nutrients, removing waste, and reproducing, highlighting the remarkable efficiency and adaptability of life at the cellular level.