Diseases which spread with communicable are often require exchanged fluid, low quality hygiene, air which is breathed by that person etc.These are often caused by pathogens or germs . Diseases can spread from one animal to another. Ho_o sapiens sapiens(humans) being animals, they may get effected from these too. Examples are;
Symbiosis in lichens is the mutually helpful symbiotic relationship of greenalgae and/or blue-green algae(cyanobacteria) living among filaments of a fungus, forming lichen. The algaeor cyanobacteria benefit their fungalpartner by producing organic carbon compounds through photosynthesis
