| A | B |
|---|
| Population | all the organisms of one species in a habitat. |
| community | Populations of different species |
| habitat | where an organism lives |
| species | Similar group of organisms which can breed to produce fertile offspring |
| niche | An organism's role in its habitat |
| biotic | Living components |
| abiotic | non living components |
| abundance | how common an organism is in its environment |
| quadrat | Square grid for sampling |
| interspecific | Competition between species |
| intraspecific | Competition within species |
| demographic transision | change of human population statistic |
| trophic levels | Feeding level with a food chain |
| net productivity | gross productivity - respiration |
| integrated pest control | combined use of biological and chemical pest control mechanisms |
| productivity | Measure of agricultural output |
| saprophytic | Nutrition from dead organisms |
| ammonification | Breakdown of organic molecules to produce ammonia |
| Nitrification | change of ammoina to nitrites then nitrates |
| fixation | turning nitrgoen gas into nitrates |
| NO2 2- | nitrites |
| NO3 - | nitrates |
| NH4 + | ammonium ions |
| NH3 | ammonia |
