The flippers of whale and forelimb of a cat are the homologous structures.
The flipper of a whale, leg of a cat, together with the wing of a bat, are all very similar to the human arm, most especially to the humerus bone, ulna and radius. These features of these animals appear to be similar in form. Bats, whales, cats, humans and many other animals have very similar homologous structures which demonstrates that they all had a common ancestor.
Homologous structures are structures that look the same between organisms regardless of their functions. Organs and structures which have a common anatomical plan and similar origin regardless of its function are regarded as homologous.
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