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Transcript
Evidence Supporting Evolution Fossils Anatomical Structures Definition: Embryology Definition: Definition: Studied by: Biochemical Definition: Also Known As: Two types show common ancestry Used to determine: Does NOT show common ancestry Examples: Vestigial Structure Features perform similar functions in organisms but are structurally different And: Examples: Human arm & Cat Leg Examples: Ostrich’s wings An embryo is an unborn animal or human young in its earliest phases. Examples: Butterfly wing & Bird wing Fish, Reptiles, Birds, & Humans all have gill slits in early stages of development but fish are the only ones to develop gills as an adult. “Life Chemicals” Scientists Study Two Types: DNA Closely related organisms: A remnant or trace of an organism of a past geologic age, such as a skeleton or leaf imprint, embedded and preserved in earth’s crust. Paleontologists Study of the formation, early growth, and development of living organisms Proteins Body structures of a living organism Human appendix Features that are similar in structure but appear in different organisms and have different functions Whale flipper & Bat wing Analogous Structures Remnants or organs or structures that had a function in an early ancestor Fly wing & Bat wing History of life on earth How different groups of organisms have evolved Homologous Structures Study of the chemical substances and vital processes occurring in living organisms Alligator leg & Bird wing Fish, Reptiles, Birds, & Humans all have tail structures in early stages of development but humans do not develop tails in mature forms like fish, reptiles, & birds do Have more similarities in their DNA and/or proteins