For each, state whether it is a homologous or analogous structure . The arm of a human and flipper of a dolphin, The tailbone of a human and the tailbone of a dog, Bird and insect wing, The mouthparts of various insects, Fin of a penguin and the dorsal (top) fin of a dolphin, The leaves of a pitcher plant and the leaves of a poinsettia, Platypus and Duck Eggs, Jointed legs of a mammal and insects, Fins of a fish and flippers of a whale.