NOUN
1. the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of
     other planets) occupied by living organisms.
       Biosphere
       NOUN
  2. an individual animal, plant, or single-celled life form. Organism
       Organism
       3. In biology, a population is all the organisms of the same group or species, which live in a
       particular geographical area, and have the capability of interbreeding.
       Habitat
  Habitat
4. In ecology, a habitat is the type of natural environment in which a particular species of
organism lives.