| A | B |
|---|
| captive breeding | the mating of animals in zoos or wildlife preserves |
| poaching | the illegal killing or removal of wildlife from their habitats |
| habitat fragmentation | breaking larger habitats into smaller, isolated pieces or fragments |
| habitat destruction | loss of natural habitat |
| threatened species | species that could become endangered in the near future |
| endangered species | species in danger of becoming extinct in the near future |
| extinction | disappearance of all members of a species from the earth |
| keystone species | a species that influences the survival of many other species in an ecosystem |
| biodiversity | the number of different species in an area |
