Definition of Terms ?1. Ecology: A study of the interrelationships between living organisms and the non-living components and processes that make up the global environment. Biosphere: The worldwide system within which all life functions. It includes the atmosphere (air), hydrosphere (water) and the lithosphere (soils, rocks)Biome: A major ecological region within which plant and animal species are similar in general characteristics and in their relationships to the physical environment. E.g.. Tundra, Deserts, Forests Grasslands etc..