What type of mouthparts do adult flies have?

Adult flies possess sponging mouthparts, which are specialized for their feeding habits. These mouthparts are adapted to lap up liquids rather than bite or chew. Flies typically feed on a variety of liquids, including decaying organic matter, nectar, and other wet substances. The structure of sponging mouthparts enables them to soak up liquids efficiently.

Unlike biting mouthparts that are adapted for grasping and tearing food, and chewing mouthparts which are used for grinding solid food, sponging mouthparts are more suitable for their feeding method. Similarly, while lapping mouthparts may suggest a similar function, they are primarily associated with bees and other insects that mix solid and liquid food. Thus, sponging mouthparts accurately describe the feeding mechanism of adult flies, making it the correct answer.