Terms : Hide Images
| 4946917869 | Primary succession | Development in a lifeless area occurs in an area that has not previously been inhabited or in which the soil profile is completely destroyed (ex. bare rock surfaces from recent volcanic lava flows, rock faces that have been scraped clean by glaciers, or a city street) | 0 | |
| 4946943945 | Secondary succession | The series of changes that occur in an area where the ecosystem has been disturbed, but where soil and organisms still exist | 1 | |
| 4946943946 | Mutualism | A symbiotic relationship between two species in which both species benefit and both species participate | 2 | |
| 4946943947 | Commensalism | A relationship between two organisms of different species where one benefits and the other is neither harmed nor benefited | 3 | |
| 4946943948 | Parasitism | A relationship between two species in which one species, the parasite, benefits from the other species, the host, which is harmed | 4 | |
| 4946952329 | Keystone species | Not necessarily abundant, but exert a strong control on community structure due to a pivotal ecological role. Examples: sea otters, sea stars, grizzly bears, prairie dogs |  | 5 |
| 4946954795 | Indicator species | Species that serve as early warnings that a community or ecosystem is being degraded. |  | 6 |
| 4946961300 | Characteristics of endangered species | Extremely small range, requiring large territories, living on islands, low reproductive success, specialized breeding areas, and specialized feeding habitats | 7 | |
| 4946963117 | Endangered species | Species that is in danger of extinction throughout all or a significant portion of its range. Examples: Northern spotted owl ( loss of old growth forest), bald eagle (DDT pollution causes thinning of eggs), Piping plover (nesting areas threatened by development |  | 8 |
| 4946968813 | Invasive species | An introduced species that spreads out and often has harmful ecological effects on other species or ecosystems. | 9 |
