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Gaseous exchange in butterflies takes place through _______ .

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spiracles

alveoli

gills

lungs

answer is A.

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Detailed Solution

Butterflies are insects. Spiracles are the chief respiratory organs of insects. Thus, gaseous exchange in butterflies takes place through spiracles.

Alveoli are the small sac-like structures found in lungs. They are the sites of gaseous exchange. Lungs are the respiratory organs found in mammals, birds, reptiles.

Gills are respiratory organs found in fish and amphibians.

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