| Term | Definition |
| habitat | place where organism lives and that provides things the organism needs to survive |
| ecosystem | the living and non-living things that interact in a particular area |
| biotic | living parts of an ecosystem that organisms come into contact with |
| abiotic | non-living parts of an ecosystem |
| water | water makes up most of our bodies/ all living things require water in order to survive |
| photosynthesis | process where plants and algae use water, sunlight, and carbon dioxide to make food |
| sunlight | important abiotic factor for plants, algae, and other living things/ needed for photosynthesis |
| oxygen | important to functioning of organisms. air we breathe is 20% pure oxygen |
| temperature | determines what type of animals will live in a specific area |
| soil | mixture of rock fragments, nutrients, air, water, and the decaying remains of living things |
| species | 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 |
| communities | all the different populations that live together in an area |
| ecology | study of how living things interact with each other and with their environment |
| organism | a living thing |