As students are taught the levels of organization from single organism to the biosphere, they are tasked with placing them in order. This activity can be played as a game if desired.
- biosphere - everywhere on Earth where living things can exist
- ecosystem - a community and the non-living things in the environment
- community - all populations that live in a given area
- population - a group of organisms of the same species that live in an area
- organism - a living thing