Genetic Data, The most modern approach to classification. Scientists look at the similarities and differences between DNA and Proteins in organisms., Genetic Data, Embryology, A modern approach to classification. Scientists look at developing embryos of different organisms to see similarities and differences., Embryology, Physiological Structures, The oldest approach to classification. Scientists look at the different physical traits of an organism to see similarities and differences., Physiological Structures, Fossil Record, A modern approach to classification. Scientists look at the time period a fossil is from to determine common ancestors of organisms., Fossil Record

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