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Dogs and insects both have apendages used for moving around, observing this similarity people use the same name to deceive all of them, legs. However to be homologous they must have been inherited by a shares ancestor (common ancestor). Going back in time from the dogs this is an ancestral creature earlier than the earliest vertabrates, before the bony fishes. Considering this it is easy to imagine these distantly related organisms (dogs and fish) did not both inherit the characteristic of having legs from a common ancestor. Therefor legs of dogs and insects are analogous, not homologous.

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12y ago

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