lichens

Lichens are unique living beings formed through a close partnership between fungi and algae (or sometimes bacteria). The fungus provides structure and protection, while the algae conducts photosynthesis to produce food for both. Together, they form a single organism that can survive in harsh environments like rocks, tree bark, and rooftops. Lichens are important because they help break down rocks into soil, serve as indicators of air quality, and provide food and habitat for various small creatures. They are resilient and can live in places where few other organisms can thrive.