| biodiversity | number of different species in an ecosystem |
| biotic factors | living things in an ecosystem |
| mutualism | a close relationship; both species benefit |
| niche | how an organism makes its living |
| parasitism | a close relationship; one species benefits, the other is harmed |
| prey | is killed and eaten |
| respiration | breaks down carbohydrates for energy; uses oxygen, gives off carbon dioxide |
| symbiosis | one species of organism lives in a close relationship to another species |
Drag corresponding items onto each other to make them disappear.
Start Game