| A | B |
|---|
| abiotic factor | the nonliving factors in an ecosystem are called |
| variation | a variety in charactertistics or organisms is called this |
| autotroph | an organism that can make its own food by using energy from the sun |
| trophic level | a level in a food chain |
| biological magnification | an increasing concentration of harmful chemicals in organisms through a food chain |
| tolerance | an organism's capacity to survive in unfavorable conditions |
| biomass | the total amount of living mass within a trophic level |
| tertiary consumer | the third consumer in a food chain |
| biome | a large area that has the same climate and communities is a |
| symbiosis | a relationship in which two species live closely together is called |
