| A | B |
| sun | the original source of energy for all organisms |
| producer | plant: uses sunlight to make food |
| Consumer | animal: an organisms that must eat food for energy |
| Herbivore | plant eat |
| Carnivore | meat eater |
| Scavenger | feeds on bodies of dead animals |
| Decomposer | gets energy by breaking down remains of dead organisms |
| Omnivore | eats both plants and animals |
| Food chain | represents how energy flows from one organism to another |
| Food web | the many energy pathways possible between organisms |
| Energy pyramid | represents the loss of energy at each level of the food chain |
| Habitat | the environment in which an organism lives |
| Niche | an organism's way of life within an ecosystem |