Final answer:
The proboscis of a butterfly is analogous to the mandibles of a caterpillar because they are both mouthparts used for feeding, but they have different structures and functions.
Step-by-step explanation:
Analogous to the mandibles of a caterpillar are the proboscis of a butterfly. Caterpillars have mandibles for chewing and eating plant material, while butterflies, which are the adult stage of the caterpillar, have a proboscis for siphoning nectar from flowers. Both the mandibles and the proboscis are mouthparts used for feeding, but they have different structures and functions.