| A | B |
|---|
| aquaculture | the practice of raising fish and other saltwater and freshwater organisms for food |
| biodiversity | the number of different species in an area |
| clear-cutting | the process of cutting down all the treees in an area at one time |
| endangered species | a species in danger of becoming extinct in the near future |
| extinction | term used to describe a species that does not have any living members |
| fishery | an area with a large population of valuable ocean organisms |
| inexhaustible resources | any living or nonliving thing in the environment of which there is a limitless supply |
| keystone species | a species that influences the survival of many others in an ecosystem |
| nonrenewable resources | a natural esource that is not replaced as it is used |
| pollution | a change in the environment that has a negative effect on living things |
| renewable resources | a natural resource that can be replaced in nature at a rate close to the rate at which it is being used |
| selective cutting | the process of cutting down only some trees in an area |
| sustainable yeild | a regular amount of a renewable resource that can be harvested without reducing the future supply |
| threatened species | a species that could become endangered in the near future |
