| A | B |
|---|
| Predation | one organism kills and eats another |
| parasitism | one organism lives on or in another organism |
| commensalism | symbiotic relationship where one organism benefits and the other is unaffected |
| competition | struggle between organisms for limited resources |
| mutualism | symbiotic relationship in which both species benefit |
| immigration | movement of organisms into an area, increased population size |
| emigration | movement of organisms out of an area, decreases population size |
| heterotroph | organism that eats other organisms |
| autotroph | organism that can make its own food |
| decomposer | organism that gets nutrients by breaking down dead organisms, recycling nutrients |
| trophic level | role organism plays in food chain |
| abiotic factors | non-living parts of environment |
| biotic factors | living parts of environment |
| invasive species | organisms that have been introduced to an environment |
| community | all living things in an ecosystem |
| population | members of one species living in an area |
| food web | interconnected food chains in an area |
| energy pyramid | diagram that shows trophic levels, producers on bottom, then primary consumers, then secondary consumers above |
| 10% rule | only about 10% of energy is passed from one trophic level to next, such as from producers to primary consumers |
| photosynthesis | process plants use to make sugar and oxygen using carbon dioxide, water, and sunlight |
| cellular respiration | process organism use to get energy from food, uses oxygen and glucose, makes ATP, water and carbon dioxide |
| nitrogen fixation | process used by some bacteria to turn free nitrogen into useable "fixed" nitrogen compounds |
| water cycle | evaporation--condensation--precipitation--runoff |
| carbon cycle | photosynthesis--cell respiration--decomposition--combustion |
| nitrogen cycle | nitrogen in air("free" nitrogen)--soil(bacteria "fix" nitrogen)--living things(protein)--soil(bacteria release "free"nitrogen again) |
