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Natural selection: members of a species that are best suited to their environment survive and reproduce at a higher rate then other members of species

ecology: The branch of biology dealing with the relationships of organisms with their environment and with each other.

artificial selection: intervention by humans in the breeding of plants or animals in order to preserve selected genetic traits

adaptation: a trait that gives an organism and advantage in it s particular environment.

biome: any major regional biological community such as that of forest or desert

variation: different types of traits

gene: the same type of DNA that is transited from one generation to another

trait: an identifying physical characteristic, habit or trend

mutation: to change or adapt to fit a habitat

carrying capacity: The number of individuals of a particular species that an environment can support

evolution: refers to the process though which species change over time

endemic: An individual or species that is endemic to a region.

selection: The process or act of selecting.

speciation: The process by which new distinct species evolve.

isolation: The state of being isolated, detached, or separated.

homeostasis: The ability of a system or living organism to adjust its internal environment to maintain a stable equilibrium; such as the ability of warm-blooded animals to maintain a constant temperature.

overpopulation: A situation which occurs when the number of occupants of an area exceeds the ability of that area to provide for those occupants.

biodiversity: the diversity (number and variety of species) of plant and animal life within a region

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Definitions from Wiktionary under the GNU FDL.
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