An environment in which an organsism lives is called its?

Habitat.

Earth itself could be considered a massive ecosystem, in which the living and nonliving worlds interact through four major subsystems: the atmosphere, hydrosphere(all the planet's waters, except moisture in the atmosphere), geosphere (the soil and the extreme upper portion of the continental crust), and biOSphere. The biOSphere includes all living things: plants (from algae and lichen to shrubs and trees), mammals, birds, reptiles, amphibians, aquatic life, insects, and all manner ofmicroscopic forms, including bacteria and viruses. In addition, the biOSphere draws together all formerly living things that have not yet decomposed.