Which of the following can be classified under the order Diptera?

Flies belong to the order Diptera, which is characterized by insects that have a single pair of functional wings. The name "Diptera" translates to "two wings," highlighting this distinctive feature. Dipterans are known for their significant diversity and include many familiar species such as houseflies, mosquitoes, and fruit flies.

In contrast, ants, beetles, and termites belong to different orders. Ants are classified under Hymenoptera, which also includes bees and wasps. Beetles fall under Coleoptera, known for their hardened forewings. Termites (which are actually a type of cockroach) are classified under Blattodea. Understanding these classifications helps in identifying various pests and understanding their ecological roles and behaviors in pest control scenarios.