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Most insects have small holes in the exoskeleton called _____, which open and close to regulate air flow. a. bronchi b. alveoli c spiracles d. trachea
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Most insects have small holes in the exoskeleton called _____, which open and close to regulate air flow. a. bronchi b. alveoli c spiracles d. trachea

User Khrys
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Answer:

Spiracles

Step-by-step explanation:

User Munazza
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Most insects have small holes in the exoskeleton called spiracles, which open and close to regulate the air flow. The holes lead to the trachea. The correct answer is C, spiracles. 
User Michael Insalaco
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