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Embryology is the study of development. How can embryological evidence tell you if two species share a common ancestor?

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TenzinTsesang
if you look at two species in their embryogenic stage. their bones and their forms look similar and you can differentiate too.
if you look at a fish and a human... 
humans wont have the the fins protruding in the fishes embryo, showing how different they are. 
gdr
Homologous structures