The bones of a whale flipper and a batwing are homo-logous structures because the structures are similar but have different functions. They have a common origin.
Homo-logous structures can be considered as similar structures that have the same evolutionary origin but may or not have the same function.
Homo-logous structures are always present in a common ancestor of the species that have these structures.
Conversely, analogous structures have the same function but they do not exhibit a common origin.
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