| A | B |
| interact | plants and animals work together with the environment to get what they need |
| producer | a living thing that makes its own food |
| consumer | a living thing that eats other living things as food |
| decomposer | a living thing that breaks down dead things for food |
| food chain | the path of food from one living thing to another |
| energy pyramid | shows that the amount of useable energy in an ecosystem is less for each higher animal in the food chain |
| food web | a model that shows how food chains overlap |
| predator | an animal that hunts another animal for food |
| prey | an animal that is hunted for food |