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,

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