Lichen on the Log

Lichen is a organism the arises from green algae.It can survive in any climate and it can live anywhere like trees, soil, weedily debris, tree leaves desert sand, rusty metal, and animal bones.    A simple slow growing plant that typically forms a low crust like, leaflike, or branching growth on rocks, walls, and trees. Oxygen is a colorless odor reactive gas. It forms about 20% of the earths atmosphere.