How do Diptera differ from other insects?

Licking oral apparatus (flies), piercing-sucking (mosquitoes)
The rear pair of wings is reduced to halteres
The front pair of wings is strongly narrowed at the base.
The larva is legless, and the flies have headless

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.