How do you change your computer screen from landscape to portrait setting? My son was playing with the computer and when I looked at the screen he somehow changed it to a landscape appearance rather than standard portrait.
Lichens have been described as dual organisms because they are symbiotic associations between two (or sometimes more) entirely different types of microorganism 1  -. a fungus (termed the mycobiont). 2  a green alga or a cyanobacterium (termed the photobiont).
For example lichens on rocks, soil and trees are dual organisms having a fungus and a cyanobacteria or chlorophyte as partners. The green organism is autotrophic, providing food for itself and the fungus. The fungus attaches the lichen onto the surface and provides protection and moisture.