| A | B |
| Producer | living things that make their own food |
| Consumer | living things that eat other living things |
| Herbivore | consumers that eat producers |
| Carnivore | consumers that eat other consumers |
| Decomposer | living things that get energy by breaking down dead things |
| Omnivore | animals that eat both producers and consumers |
| Scavenger | an animal that eats dead animals, but does not kill them itself |
| Ecosystem | the living and non-living things in an environment |
| Symbiosis | a partnership between living things |
| Mutualism | a symbiotic relationship where both partners benefit |
| Commensalism | a symbiotic relationship where one partner benefits and the other isn't affected |
| Parasitism | a symbiotic relationship where one partner benefits and the other is harmed |
| Host | the animal that is the source of food for the parasite |
| Food Chain | the path by which energy is passed from one living thing to another |
| Food Web | the combined food chains in an area |