| Term | Definition |
| trophic levels | Links in food chains |
| food web | A diagram showing the interaction between producers, primary consumers and secondary consumers |
| biodiversity | the number of different species within a community |
| mutualism | (symbiosis) where two organisms benefit from their relationship with each other |
| commensalism | one species benefits from the interaction with another species while that species is unaffected |
| amensalism | one species is harmed from the interaction with another species while that species is unaffected |
| competition | different animals or plants that fight for the same food resource, water or nesting material |
| exploitation | where one species benefits from interaction with another while the other is harmed |
| herbivory | when herbivores eat plants but the plants do not suffer |
| parasitism | when a parasite lives on a host and feeds off it |
| photosynthesis | the process of plants using the sun's warmth for energy |
| producers | organisms that produce their own food |
| consumers | organisms that cannot produce their own food |