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3.3 Biodiversity
| Term | Definition |
|---|---|
| extinction | the disappearance of all members of a species from Earth |
| captive breeding | the mating of animals in zoos or wildlife preserves |
| habitat destruction | the loss of a natural habitat |
| gene | a structure in an organism's cells that carries hereditary information |
| threatened species | a species that could become endangered in the near future |
| poaching | illegal killing or removing of wildlife from their habitats |
| biodiversity | the number of different species in an area |
| habitat fragmentation | the breaking of a habitat into smaller, isolated species |
| endangered species | a species in danger of becoming extinct |
| keystone species | a species that influences the survival of many others in an ecosystem |