respiratory-system-grasshopper-abdomen-spiracles-thorax.jpg (1600×1067) (britannica.com)
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Craig Knox
http://images.tutorvista.com/content/respiration/grasshopper-respiratory-system.jpeg
http://www.baileybio.com/plogger/images/ap_biology/animal_diversity_project_-_must_cite_your_textbook_/insects_-_tracheae.jpg
