| A | B |
|---|
| population density | number of individuals of a particular species per unit area or volume |
| exponential growth | rapid population that multiplies by a constant factor at constant time intervals |
| limiting factor | condition that restricts a population's growth, such as space, disease, or food |
| carrying capacity | number of organisms in a population that an environment can maintain |
| density-dependent factor | factor that limits a population more as population density increases |
| density-independent factor | factor unrelated to population density that limits a population |
| age structure | proportion of people in different age groups in a population |
| competetive exclusion | one species succeeds over another when competing for the same resouces |
| intersepcific competition | competition between species that depend on the same limited resource |
| niche | an organism's habitat, food sources, time of day it is most active, etc |
| predation | interaction in which one organism consumes another |
| symbiotic relationship | close interaction between species in which one species lives in or on the other |
| parasitism | relationship in which one organism obtains its food at the expense of a another |
| mutualism | type of symbiotic relationship in which both organisms involved benefit |
| commensalism | relationship in which one organism benefits and the other is not harmed or helped |
| ecological succession | series of changes in the species in a community, often following a disturbance |
| primary succession | process by which a community arises in a virtually lifeless area with no soil |
| secondary succession | changes that occur to a community after a disturbance where soil is left intact |
| introduced species | species moved by humans to new geographic areas; intentional or accidental |
