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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