Natural environments

2. A group of ecosystems that share the similar climates and typical organisms
3. An increasing interdependence among peoples and nations in our "shrinking" world
6. A collection of different populations that live together in a defined area
7. Any living part of the environment
8. Organisms that can make their own food
12. The use of global resources at a rate that allows natural regeneration
13. Organisms that need to eat food from another source

1. Sets of interacting and or independent components
4. The part of earth in which life exists, including land, water, air or atmosphere
5. Any nonliving part of the environment
9. A living thing
10. A group of individuals that belong to the same species and live in the same area
11. The relationship between cause and effect