Habitat for Humanity has its headquarters in Americus, Georgia, United States since 1920.
 Many of these habitat types grade into each other and each one has its own typical communities of plants and animals
 There are bacteria, for example, living in Lake Whillans, half a mile below the ice of Antarctica; in the absence of sunlight, they must rely on organic material from elsewhere, perhaps decaying matter from glacier melt water or minerals from the underlying rock

