Levels of Organization

Front

The smallest unit of a chemical substance

Back

atom

Front

Smallest unit of life

Back

cell

Front

A group of similar cells with a similar purpose within an organism

Back

tissue

Front

A group of organs that work together within an organism

Back

organ system

Front

A group of tissues that form a compartment with a particular function within an organism

Back

organ

Front

Populations of different species who inhabit the same area

Back

community

Front

A group of organisms of the same species who inhabit the same area

Back

population

Front

A single member of a species

Back

organism

Front

All the organisms and abiotic factors that exist within a particular area

Back

ecosystem

Front

A group of similar ecosystems that cover a large area of the biosphere

Back

biome