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Describe the structure of the gills
What is the counter-current system?
Outline the process of ventilation in fish
What is the name for the gas exchange system in insects?
Describe the tracheal system
Complete the sentences:
Insects uses rhythmic ____________ movements to change the ________ of their bodies and move air in and out of the ___________. Larger insects use their _______ movements to pump their ___________ too.
Insects usually have hairs around the spiracles. Why?