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According to embryology, why do fish and birds have a common ancestor?
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According to embryology, why do fish and birds have a common ancestor?

User Pete Florence
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Onesimilarity is that they having very similar embryo's!
User Ragunathan
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fish, reptiles, birds, and mammals have very similar embryos with gill slits and tales, but all but fish get rid of the gills as they mature
User Garpitmzn
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