Ecological Levels of Organization.

1. ecosystem-a biological community of interacting organisms and their physical environment. Example of a ecosystem is the world

2. biosphere-the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms. Example of biosphere is the earth atmosphere.

3. habitat-the natural home or environment of an animal, plant, or other organism. Example of a habitat is a forest.

4. individual-single; separate.

5. population-all the inhabitants of a particular town, area, or country. Example of population is

6. community-a group of people living in the same place or having a particular characteristic in common. Example of community is bellefonte.