evolution - The gradual change in a species over time, scientific theory - A well-tested concept that explains a wide range of observations, comparative anatomy - The comparison of the structures of different organisms, homologous structures - Similar structures that related species have inherited from a common ancestor (ie backbone, four limbs), embryology - The study of fertilized eggs and their development, variation - Any difference between individuals of the same species, competition - Direct and indirect interactions for limited resources (ie: food, shelter), habitat - The specific environment that provides the things an organism needs to live, grow, and reproduce, genetic diversity - Differences in traits of organisms, geographic isolation - When some members of a species become cut off from the rest of the species, common ancestor - A shared relative and source of inherited traits, branching tree diagram (aka cladogram) - An organized way to show the probable evolutionary relationships (common ancestors) among organisms, shared derived characteristic - Usually a homologous structure that is common to all organisms in a group, natural selection - The process by which the distribution of traits in a population changes over many generations,

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