(a) Tracheole
(b) - Always moist for gases to dissolve and diffuse in solution form
-Thin epithelium to allow diffusing gases and diffuse in solution form
- A large surface area for efficient diffusion of gases
-Well supplied with blood vessel to maintain a steep concentration gradient
-Ventilation mechanism for bringing in air rich in oxygen and expelling air rich in carbon (IV) oxide
johnmulu answered the question on May 4, 2017 at 04:55
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