Final answer:
The statement that insects have tracheal tubes used for respiration is true. Insects' tracheal system is a highly specialized respiratory system consisting of a network of chitin tubes connected to spiracles for gas exchange.
Step-by-step explanation:
Insects do indeed have tracheal tubes used for respiration, so the statement is true. These tracheal tubes, or tracheae, are part of an intricate and efficient respiratory system that is entirely separate from the insect's circulatory system. The tracheal system in insects consists of a network of small tubes that carry oxygen directly to the body's cells. The tubes are made of a material called chitin and are connected to the outside environment through openings known as spiracles.
These spiracles are located along the thorax and abdomen of an insect's body, regulating the diffusion of CO2 and water vapor.