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Most insects have small holes in the exoskeleton called _____, which open and close to regulate air flow. bronchi alveoli spiracles trachea
Weegy: D. Trachea (More)
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Updated 1/18/2014 8:26:49 AM
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Most insects have small holes in the exoskeleton called spiracles, which open and close to regulate air flow.
Added 1/18/2014 8:26:49 AM
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