Asked by b
ook at the sketches. The sketch on the top is of a fish embryo, and the sketch on the bottom is of a chicken embryo.
Which of the following statements is the best explanation for why the embryos look so similar, considering how different an adult fish and chicken are?
Fish and chickens both need gills.
Fish and chickens are both mammals.
Fish and chickens share a common ancestor.
All Answers 1
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Fish and chickens share a common ancestor.
Early embryos of different vertebrates look similar because they use conserved developmental genes and pathways inherited from a common ancestor. Structures that look like gill slits in embryos (pharyngeal pouches) can develop into gills in fish but into parts of the ear, throat, or neck in birds and mammals.
Early embryos of different vertebrates look similar because they use conserved developmental genes and pathways inherited from a common ancestor. Structures that look like gill slits in embryos (pharyngeal pouches) can develop into gills in fish but into parts of the ear, throat, or neck in birds and mammals.
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