| A | B |
|---|
| Ecosystem | All the living and nonliving things that interact in a particular area |
| Habitat | A place where an organism lives and that provides the things the organism needs |
| Biotic factor | The living parts of an ecosystem |
| Abiotic factor | The nonliving parts of an ecosystem |
| Photosynthesis | A process in which organisms use water, along with sunlight and carbon dioxide, to make food |
| Species | A group of organisms that are physically similar and can reproduce with each other to produce fertile offspring |
| Population | All the members of one species in a particular area |
| Community | All the different populations that live together in an area |
| Ecology | The study of how living things interact with each other and with their environment |
| Population density | the number of individuals on a specific area |
