| A | B |
|---|
| Ecology | The study of the interactions between living and nonliving things |
| Population | A group of interbreeding organisms coexisting together |
| Community | A group of populations living and interacting in the same area |
| Ecosystem | An association of living organisms and their physical environment |
| Biome | A group of ecosystems classified by climate and plant life |
| Primary consumer | An organism that eats producers |
| Secondary consumer | An organism that eats primary consumers |
| Tertiary consumer | An organism that eats secondary consumers |
| Ecological pyramid | A diagram that shows the biomass of organisms at each trophic level |
| Biomass | A measure of the total dry mass of organisms within a particular region |
| Transpiration | Evaporation of water from the leaves of a plant |
| Watershed | An ecosystem where all water runoff drains into a single body of water |
| Greenhouse effect | The process by which certain gases (principally water vapor, carbon dioxide, and methane) trap heat that would otherwise escape the earth and radiate into space |
