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In insects, what is the adaptive significance of spiracles? in insects, what is the adaptive significance of spiracles? they dilate and constrict during flight or other types of movement, functioning as a "breathing" mechanism. they close off tracheae to minimize water loss. they are thin and highly branched, offering a large surface area for gas exchange. they open into the body cavity, allowing direct contact between hemolymph and tissues.

User Konr Ness
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They close off tacheae to minimize water loss.
User Chase Cromwell
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