| Term | Definition |
| Food Web | A diagram that shows all the different pathways that energy can flow through an ecosystem. |
| Herbivore | Plant eater |
| Consumer | An organism that gets its energy from feeding on another organism. They are identified based on what it is they eat. |
| Producer. | An organism that makes its own food using energy from the sun. They support the entire food web! |
| Overpopulation | When the number of individuals within an environment becomes so large that there are not enough resources to support them all. |
| Invasive species | Plants, animals and microorganisms not originally from a geographic area. They have a negative impact on biodiversity. |
| Biodiversity | The number and variety of living organisms in an area. |
| omnivore | Consumers that eat both plants and animals. |
| Scavenger | A carnivore that feeds on the bodies of dead organisms. |
| Decomposer | Fungi and bacteria break down waste products and dead organisms into the elements they were made of. These raw materials are returned to the ecosystem. |
| Food Chain | A line up of organisms that illustrates how one eats the other. |
| Energy Pyramid | A diagram that shows how energy is distributed in each feeding level of a food web. |
| Which level of a food pyramid has the most energy? | The lowest level containing the producers. |
| Which level of a food pyramid has the least amount of energy? | The highest level containing the top predators. |