Biosphere :

Where all living things on earth live.

Biome: a large naturally occurring community of flora and fauna occupying.

Ecosystem:

Interactions among populations in a community and the community's physical surrounding.

Community :

Collection of several interacting populations that inhabit a common environment.

Population :

Group of organisms of one species that interbreed and live in the same place at the same time.

Organism:

Anything that possesses the characteristics of life