Final answer:
Insects lack a circulatory system for gas transport due to their specialized tracheal system.
Explanation:
Insects do not have a circulatory system for the transport of gases because they have a specialized respiratory system called the tracheal system.
The tracheal system consists of small tubes made of chitin that directly deliver oxygen to the entire insect body.
This specialized respiratory system allows insects to efficiently obtain oxygen without relying on a circulatory system like vertebrates.
Learn more about Insect respiration and circulatory systems here:
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