Evolution - A change in the heritable characterisitics of a population over time., DNA - The evidence that Darwin did NOT have access to., Natural Selection - Some individuals are better able to survive and reproduce compared to others., Mutation - Change in a gene, Variation - Differences among individuals within a population, Layers deeper in the earth - Oldest fossil layer is found here., Homologous - structures in different organism that show common ancestry. Ie: whales flipper and human arm, Analogous - features of different species that have a similar function. They do not have a common ancestor. Butterfly wing and bats wing., Vestigial - A structure that is no longer useful to the current form of an organism., Embryology - Vertebrate embryos from humans and fish have a tail in early development., Ancestor - Scientists compare organism's DNA to test the theory that they all share a common _____________., Gene pool - All the genes in a population, Non-random mating - Individuals select their mates based on traits., Gene flow - Movement of genes from one population to another., The animals located on the closet branches - The animals that are the most closely related on a phylogenetic tree, Fossils - Ancient remains of organisms preserved in rock layers, Adaptation - The long tongue of a gecko is an example of., Immigration - When individuals move into a population, Camouflage - The ability to blend into the environment., Extinction - Permanent loss of all species.,

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