• They have 3 pairs of jointed legs
• They usually have 2 pairs of wings
• They have a pair of compound eyes
• They have a pair of antennae for feeling and smelling
• They use spiracles and tracheae for respiration
• Their bodies are divides into 3 parts; the head, the thorax, the abdomen 
• Their bodies are covered with exoskeleton made up of chitin which prevent water loss, protects them from bacteria, gives them their shapes and allows for rapid movement.
• They usually have 3 pairs of mouth parts

They under the process of metamorphosis