Planaria

Planaria are small, flatworms known for their remarkable ability to regenerate lost body parts. They have simple yet effective nervous systems, including a brain-like structure and paired nerve cords. Found in freshwater environments, they feed on small microorganisms and organic matter. Their regenerative capacity is due to abundant stem cells called neoblasts, which can differentiate into any cell type needed to rebuild tissues. Study of planaria helps scientists understand basic processes of regeneration, tissue renewal, and stem cell biology, making them valuable models in biological research.