| A | B |
|---|
| renewable resource | a resource that is naturally replaced in a short amount of time |
| nonrenewable resource | a natural resource that is not replaced as it is used |
| pollution | a change to the environment that has a negative impact on living things |
| development viewpoint | the belief that humans should use the land and benefit or profit from it |
| preservation viewpoint | the belief that ecosystems should be left alone |
| conservation viewpoint | belief that people should use resources as long as they don't destroy the ecosystem |
| biodiversity | the number of species in an area |
| keystone species | a species that influences the survival of many others in an ecosystem |
| extinction | the disappearance of all members of a species from Earth |
| endangered species | a species that is in danger of becoming extinct |
| threatened species | a species that could become endangered in the future |
| poaching | the illegal killing of animals |
