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.
1. A lichen is a combination of fungus and algae that lives on the sides of trees, rocks, and other materials.The fungus provides the algae with water and minerals and the algae uses the water and minerals to make food for both organisms.What type of relationship does the lichen represent?. A lichen is a combination of fungus and algae that lives on the sides of trees, rocks, and other materials.