| A | B |
| symbiotic relationship | any type of a close and long-term biological interaction between two different biological organisms |
| niche | match of a species to a specific environmental condition; the job of an organism |
| herbivore | organism that eats only plants |
| omnivore | organism that eats plants and meat |
| carnivore | organism that eats only meat |
| producer | organism that produces their own energy; plant |
| decomposer | organism that consumes dead matter; fungi |
| predator | organism that hunts/kills for food |
| prey | organism that is hunted by another for food |
| parasite | organism that slowly feeds on another organism |
| primary consumer | the first consumer in the food chain; eats producer; usually herbivore |
| secondary consumer | the second consumer in the food chain; usually omnivore or carnivore |
| tertiary consumer | the last consumer in the food chain; usually carnivore; often top predator |
| detrivore | organism that eats only dead matter; i.e. decomposer |
| food chain | linear network of links in a food web starting from producer organisms and ending at an apex predator species, detritivores, or decomposer species |
| food web | interconnected food chains |
| commensalism | symbiotic relationship where one organism benefits, another is UNAFFECTED |
| mutualism | symbiotic relationship where BOTH organisms benefit |
| autotroph | trophic level where organisms produce their own energy; photosynthesis |
| heterotroph | trophic level where organisms consumer other energy sources |