Official approaches to squatter settlements and the housing of the urban poor have changed over time from policies of clearance and relocation to schemes which promote the involvement of the private sector and nongovernmental organizations in supporting poor residents to improve their own housing and neighborhoods.n this article, the main debates surrounding squatter settlements are outlined, focusing on definitional issues and their geographical distribution. The changing nature of policies toward these settlements is also covered.
Lichen. Lichen is a structure that commonly grows on trees; it is a result of a symbiotic relationship between algae and fungi. The fungus provides a structure that collects water and nutrients that the algae takes advantage of; the algae in turn uses its chlorophyll to produce food for both itself and the fungus.Species of the Trentepohlia genus are commonly found in lichens.he fungus provides a structure that collects water and nutrients that the algae takes advantage of; the algae in turn uses its chlorophyll to produce food for both itself and the fungus. Species of the Trentepohlia genus are commonly found in lichens.
Mycomycota is the name for the fungi in lichens. Lichens are composed of fungus and algae in a symbiotic relationship, as the algae provides nutrients, while the fungus protects it from the elements. Lichens photosynthesize light, with photoautotrauphs located near the surface of the fungi.hey are crucial decomposers, feeding on living and decaying organisms. They live in aquatic and semi-aquatic environments (even damp soil), in both salt and freshwater bodies of water. They are distinguished by their flagellated spores or gametes, which help the reproductive units repel through water.