| A | B |
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| population | a group of organisms of the same species that live in a specific geographical area and interbreed |
| density | the number of individuals of the same species that live in a given unit of area |
| dispersion | in ecology, the pattern of distribution of organisms in a population |
| growth rate | an expression in the increase in size of an organism or population in a given unit of time |
| reproductive potential | the maximum number of ofspring that a given organism can produce |
| exponential growth | logarithmic growth. or growth in which numbers increase by a certain factor in each successive time period |
| carrying capacity | the largest population that an environment can supprot at any given time |
| niche | the unique position occupied by a species, both in terms of its physical use of its habitat and its function within an ecological community |
| competition | the relationship between two species(or individuals) in which both species (or individuals) attempt to use the same limited resource such that both are negatively affected by the realationship |
| predation | an interaction between two species in which one species, the preadtor, feeds off of the other species, the prey |
| parasitism | a relationship between two species in which one species, the parasite, benefits from the other species, the host, and usually harms the host |
| mutualism | a realtionship between two species in which both benefit |
| commensalism | a realtionship between two organisms in which one organism benfits and the other is unaffected |
| symbiosis | a relationship in which two different organisms live in close association with each other |
