The pectoral fins of a whale and a shark. Are they analogous organs? I was looking at this question, and I saw that the two answers defined the range of 'same origin' differently. One said that sharks and whales have the same origin as jawed animals, (therefore they are homologous) and the other said that they had different origins, namely cartilaginous fish and mammals(therefore they are analogous). Now here's the question.
How large is the range of 'same origin' when determining whether two organs are analogous or homologous? Is it as large as a Kingdom or a Phylum? Class? Order? Family? Or is there another criterion?
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