biodiversity - the number of different species in a given area, gene - A piece of DNA that codes for a specific trait that can be inherited buy the organism's offspring, keystone species - Species that are critical to the functioning of an ecosystem, ecotourism - tourism that supportsthe conservation and sustainable development of unique environments, endangered species - A species that is likely to become extinct if measures are not taken immediately., threatened species - A species that has a declining population and is likely to become endangered if not protected. , exotic species - A species that is not native to a particular area, poaching - illegal hunting, fishing, harvesting and trade of wildlife, endemic species - A species native to and found only within a limited area, Endangered Species Act - A law designed to protect plant and animal species in danger of extinction,

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