Abiome can be defined as
a group of interacting individuals of the same species within the same geographic area
a group of interdependent organisms and nonliving factors they depend on
a place where an organism naturally lives or grows
a large group of plants and animals living together in a specific climate

a large group of plants and animals living together in a specific climate

Biome is an area where living things adapt to survive, mainly these are the weather, geological area, temperature, resources available and etc. 

Example:
in the desert area, most decomposers have a hard time to stay alive in the place because it’s hot and dry. Most decomposers prefer moist area. Here are lists of the decomposers in the desert that manage to stay alive despite of the place risk.