| A | B |
| Organism | Any living thing |
| Individual | A single example of a member of a population |
| Population | All organisms of the same species in an area |
| Community | All the interacting populations in an area |
| Ecosystem | A community plus the abiotic factors. |
| Abiotic | Nonliving |
| Biotic | Living |
| Habitat | A place where an organism gets all its needs met |
| Qualitative Observations | Descriptions using your senses |
| Quantitative Observations | Measuring, counting or estimating |
| Ecology | The study of ecosystems |
| Aquatic | Having to do with water |
| Terrestrial | Having to do with land |
| Species | An organism type that's different from all other organism types |
| Biology | The study of life |
| Inference | A logical conclusion based on observed data |
| Aquarium | A miniature water habitat |
| Terrarium | A miniature land habitat |
| Food Chain | A sequence of organisms that eat each other |
| Food Web | All the feeding relationships in an ecosystem |
| Observational Study | Watch and collect data with no interaction |
| Experimental Study | Change a variable and collect data to see the response |