Adaptation - A trait that helps an organism survive and reproduce in its environment., Natural Selection - The process by which organisms better suited to their environment tend to survive and reproduce., Mutation - A change in the DNA sequence that can lead to a new trait in an organism., Gene Pool - The collection of all the genes in a population., Speciation - The formation of new and distinct species in the course of evolution., Variation - Differences in traits among individuals in a population., Fitness - The ability of an organism to survive, reproduce, and pass on its genes., Artificial Selection - The intentional breeding of organisms to produce desired traits., Fossil - The preserved remains or traces of organisms from the past., Common Ancestor - An ancestral species from which two or more species have evolved., Phylogeny - The evolutionary history and relationships among species., Genetic Drift - Random changes in allele frequencies in a small population., Homologous Structures - Body parts in different species that have a similar structure but may have different functions., Analogous Structures - Body parts in different species that serve similar functions but have different evolutionary origins., Convergent Evolution - The process by which unrelated species develop similar traits due to similar environmental pressures., Divergent Evolution - The process by which two related species become more different over time due to different environments., Gene Flow - The transfer of genetic material between populations of the same species., Coevolution - The process by which two species evolve in response to each other., Extinction - The complete disappearance of a species from the Earth., Evolutionary Tree - A diagram showing the evolutionary relationships among species, often called a phylogenetic tree.,

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