| A | B |
|---|
| Extinct | population has died out |
| Exotic | nonnative organisms |
| Symbiosis | long term relationship between organisms |
| Food Web | relationship between many food chains |
| Competition | contest between organisms for resources |
| Energy Pyramid | Shows amount of energy passing from one level of a food chain to the next |
| Learned Behaviors | Behaviors that are taught. |
| Decomposer | Breaks down tissues of decaying organisms. |
| Ecosystem | Community of organisms and their physical environment. |
| Threatened | Likely to become endangered |
| Instinct | Behavior an organism inherits |
| Food Chain | How the consumers in an ecosystemare connected to one another by what thet eat. |
| Niche | Role of a population in a habitat. |
