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The tubes of an insect's air system are made of a polymer called:

AChlorine
BChromium
CCharcoal
DChitin
Answer & Solution
Correct answer: D. Chitin
1. The same material stiffens the exoskeleton. 2. It keeps the tubes open. 3. That material is chitin. _Source: OpenStax Biology 2e, Chapter 39, The Respiratory System._
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