| Environmentalresistance | | A particular type of organism, where two individuals interbreed to produce offspring |
| Population | | The particular place where a community of organisms is found |
| Migration | | The connection between predator and prey populations |
| Biome | | Factors whose effects on a population are relatively greater at higher population densities than at lowere population densities |
| Biotic | | Factors that slow down the growth rate of species |
| Scurve | | All of the different populations of organisms that live together |
| Community | | Something that live in or on something else and causes harm |
| Niche | | Doesn't live long but reproduces a lot |
| Abiotic | | Movement of a specieas from one ecosystem to another |
| Species | | An ecosystem covering a broad area which has distinctive climatic and soil conditions |
| Interspecificcompetition | | The maximum number of organisms an area can support sustainably |
| Biosphere | | All the members of a single species living in a particular area at the same time |
| Intraspecificcompetition | | A factor whose effect on a population is the same whatever the population (usually Abiotic) |
| Jcurve | | The part of the earth where life can exist |
| Carryingcapacity | | Caused by living organisms |
| Predatorpreyrelationships | | A description of the precise way in which an organism fits into its environment. |
| Habitat | | Lives long and isn't predated |
| Parasite | | Non living components of the environment |
| Densitydependentfactors | | Competition between members of the same species |
| Densityindependentfactors | | Competition between different species |