| A | B |
|---|
| renewable resource | a resource that is naturally replaced in a relatively short time |
| nonrenewable resource | a natural resource that is not replaced as it is used |
| pollution | a change to the environment that has a negative effect on living things |
| development viewpoint | the belief that humans should be able to freely use and benefit from all Earth's resources |
| preservation viewpoint | the belief that all parts of the environment are equally important, no matter how useful they are to humans |
| conservation viewpoint | the belief that people should use natural resources as long as they do not destroy those resources |
| clear-cutting | the process of cutting down all the trees in an area at once |
| selective cutting | the process of cutting down only some trees in an area |
| sustainable yield | a regular amount of a renewable resource that can be harvested without reducing the future supply |
| fishery | an area with a large population of valuable ocean organisms |
| aquaculture | the practice of raising fish and other water organisms for food |
| keystone species | a species that influences the survival of many others in an ecosystem |
| gene | a structure in an organism's cell that carries its hereditary information |
| endangered species | a species in danger of becoming extinct in the near future |
| threatened species | a species that could become endangered in the near future |
| habitat destruction | the loss of a natural habitat |
| habitat fragmentation | the breaking of a habitat into smaller, isolated pieces |
| captive breeding | the mating of endangered animals in zoos or preserves |
| taxol | chemical in Pacific yew tree bark that has cancer-fighting properties |
