A) Mollusca
B) mammals
C) Arachnida
D) earthworm
Correct Answer: C
Solution :
Book lungs are respiratory organs of Arachnida (the scorpion). The respiratory system consists of four pairs of cuticular book lungs or pulmonary sacs. One pair of them lies inside each mesomemc segment from 3 to 6. Lungs are the respiratory organs of mammals. Skin is the respiratory organ of the earthworm. Gills, body surface, mantle, lungs are the respiratory organs of Mollusca.
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