Why are the wings of a whale’s flipper bird considered homologous organs?

First you need to know what homologous organs are.
Homologous organs are organs that have a common origin and a similar structure. The functions they perform can be both the same and different (for example: a human hand and a bird’s wing).
Whale fins and bird wings have a common origin and a similar structure, so they are considered homologous organs.



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