Which of the following animals has a respiratory system with one way flow of the air through the lungs, and the air is renewed after inspiration?

Explanation

Birds have a unidirectional respiratory system in which air sacs drive air through the parabronchi during both inhalation and exhalation. This keeps fresh air moving across the respiratory surfaces and makes gas exchange highly efficient. Students may choose cockroach because it also has a specialised respiratory system, but cockroach tracheae do not produce the bird-like one-way lung flow.