| A | B |
| ecology | study of the interactions of living organisms with one another and their physical environment |
| habitat | the place where a particular population of species lives |
| species diversity | the number of species within an ecosystem |
| primary productivity | the amount of organic material that the photosynthetic organisms of an ecosystem produce |
| producers | organisms that produce their own food |
| consumers | organisms that obtain energy by consuming plants and/or other organisms |
| herbivores | plant eaters |
| carnivores | meat eaters |
| omnivores | animals that are both carnivores and herbivores |
| food chain | path of energy through the trophic levels of an ecosystem |