| Term | Definition |
| biodiversity | the nimber and variety of different species in a given area |
| gene | a piece of DNA that codes a specific trait |
| keystone species | species that are critical to the functioning of an ecosystem |
| ecotourism | a form of tourist that supports the conservation and sustainable development of ecologically unique area |
| endangered species | a species that is likely to become extinct |
| threatened species | a species that has a declining population and that is likely to becomed endangered if it is not protected |
| exotice species | a species that is not native to a particular region |
| poaching | illegally killing or hunting animals in an area |
| endemic species | species that are native to and found only within a limited area |
| germ plasm | any form of genetic material |
| habitat conservation plan | a plan that attempts to protect one of more speices across large areas lf land through trade-offs or cooperative agreements |
| biodiversity treaty | an important result of the Earth Summit |