| A | B |
| Commensalism | A relationship where one species gets an advantage and the other is unaffected |
| Mutualism | A relationship where both species are benefited |
| Parasitism | A relationship where one species is benefited and the other is disadvantaged |
| Parasite | An organism that requires a host to live |
| Symbiosis | A relationship where at least one organism benefits |
| Host | An organism that a parasite obtains nutrients from |
| Predation | One organism kills and eats another |
| Example of Mutualism | Algae provides glucose for coral, while coral provides CO2/a home for algae |
| Example of Predation | A bird hunts and eats a grasshopper |
| Example of Commensalism | A lizard uses a plant for shade |
| Example of Parasitism | A bacterium invades a plant, making it produce more bacteria using the plant cell's nutrients and "machinery" |