| A | B |
|---|
| Competition | A contest among organisms for limited resources |
| Symbiosis | A long-term relationship between different kinds of organisms |
| Food Web | Shows the relationship between different food chains |
| Threatened | Organisms that are likely to become endangered if they are not protected |
| Exotic | Nonnative organisms |
| Extinct | A population that no longer exists |
| Endangered | Organisms whose populations are so small they may become extinct |
| Learned Behavior | Behaviors learned from an animal's parents |
| Instinct | Behaviors that organisms inherit |
| Food Pyramid | Shows the amount of energy available to pass from one level of a food chain to the next |
