Evolution, Slow change of species over time, Homologous Structures, structures with different functions but have same origin, Analogous Structures, structures with similar functions but different origin, Vestigial Structures, reduced or absent structures; but they are useful in related species, Divergent evolution, common ancestor splits into two or more species that become more different due to different environmental pressures, Convergent evolution, unrelated species become more similar due to similar environmental pressures, Species, group of genetically similar organisms that interbreed and produce fertile offspring, Reproductive isolation, two populations can no longer interbreed, Living fossil, living species relatively unchanged from its ancestors, Prezygotic, reproductive barrier before fertilization, Postzygotic, reproductive barrier after fertilization; prevents healthy development, Gametic isolation, gametes come into contact, but no fertilization takes place, Mechanical isolation , differences in reproductive organs prevent interbreeding, Behavioral isolation , differences in courtship or mating that cause inability to mate, Temporal isolation, inability to mate due to differences in mating times, Geographic isolation, separation by a physical barrier that prevents mating and gene flow, Fossils, found in sedimentary rock from deposits of sand, silt, clay, Comparative embryology, shows homologous structures in embryos not visible in adults, Biogeography, geographic distribution and environment of living organisms , Biochemical similarities, amount of similar DNA and protein sequences show degree of relatedness.

Evolution

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