| Term | Definition |
| Food Chain | A chain that shows how organisms get food and energy |
| Consumer | Organism that eat each other |
| Ecosystem | All living and non-living things |
| Food Web | All the food chains in an ecosystem |
| Elver | A young eel |
| Producer | Organisms that get energy from sun and make own food |
| Decomposer | Living thing that gets energy from dead plants and animals |
| Organism | Living thing |
| Omnivore | A consumer that eats both meat and plants |
| Carnivore | A consumer that only eats meat |
| Herbivore | A consumer that only eats plants |
| Plankton | Tiny microscopic plant and animal organisms that float in the water |
| Phytoplankton | Plant Plankton |
| Zooplankton | Animal Plankton |
| Species | A group of organisms that are the same |
| Adaptation | A special body feature or behavior that helps an organism stay alive |
| Habitat | An area in which an organism lives |