| A | B |
|---|
| Food chain | the sequence of transfers of matter and energy in the form of food from organism to organism |
| Trophic level | The position an organism occupies in a food web |
| Ecosystem | An ecosystem consists of all the organisms and the physical environment with which they interact |
| Primary consumer | make up the second trophic level, also known as herbivores |
| Food web | a system of interlocking and interdependent food chains. |
| Decomposer | Organisms that break down dead or decaying organisms |
| Producer | an organism which produces its own food through photosynthesis. |
| Tertiary Consumer | a carnivore near the topmost level in a food chain that feeds on other carnivores, consumed by quaternary |
| Secondary consumer | a carnivore that feeds only upon herbivores. |
| Quaternary Consumer | often top predators within the environment, and they eat the tertiary consumers. |
