| A | B |
|---|
| ecology | study of interactions among organisms and their environment |
| limiting factor | limits the number of organisms in an environment |
| carrying capacity | the largest amount of organisms that an enviromnent can support and maintain |
| producers | the first level of the food chain |
| nitrogen fixation | changing nitrogen gas to nitrogen in the soil |
| energy | required for recycling matter |
| biotic factors | living organisms |
| predation | one organism kills and feeds on another organism |
| mutualism | symbiotic relationshop that benefits both species |
| water | cell fluids are mostly this compound |
| number of individuals in a population | size |
| number of individuals that occupy a definite area | density |
| maximum rate of population increase | biotic potential |
| reduces the number in the population | limiting factor |
| arrangement of organisms in an area | spacing |
