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Insecta (view source)

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====Respiratory System====

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*Branching [[Trachea - Anatomy & Physiology|trachea]] strengthened by ~~spial~~ thickenings in the walls

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*Branching [[Trachea - Anatomy & Physiology|trachea]] strengthened by spiral thickenings in the walls

*[[Trachea - Anatomy & Physiology|Trachea]] communicate with outside via spiracles

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