What is meant by spiracles ?
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An external respiratory opening, especially each of a number of pores on the body of an insect, or each of a pair of vestigial gill slits behind the eye of a cartilaginous fish.
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Insects such as cockroach and grasshopper have a tracheal system running all along their body. The air tubes called trachea open through small openings called spiracles for exchange of gases.
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