The morphology of the extremities is a pattern shared by the bodies of these three animals, which is due to evolutionary homo-logy.
What are homo-logous structures?
Homo-logous structures are body structures that may or not may have the same function but share an evolutionary origin.
Conversely, analogous structures have the same functions but they are not found in a common ancestor.
In conclusion, the morphology of the extremities is a pattern shared by the bodies of these three animals, which is due to evolutionary homo-logy.
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