In this simulation you can explore the different levels of biological organization that can be illustrated in 3 different ecosystems.

1. Choose one of the 3 ecosystems by pressing one of the + signs on the Biosphere screen.
2. Navigate through the different biological levels of organization in the ecosystem you have chosen. You can do this by pressing the + and - buttons to go below or above your current level of organization.
3. Alternatively, press a term for one of the different biological levels of organization, located on the bottom of each screen.
4. To choose a different ecosystem, press , which returns you to the Biosphere screen