Answers: C and D - The pairs that are not analogous are the legs of a cat and the legs of a dog, and the the arm of a chimpanzee and the flipper of a dolphin. Those are actually homologous structures.
Key Takeaway: Analogy occurs when two structures evolve independently in different species to perform the same function. This does not refer to similar structures in closely related species, but in species that are vastly different. These structures evolved over time as a result of convergent evolution, the process by which different species become more similar.
