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B
Crustaceans
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C
Arachanids
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D
Onychophores
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Solution
The correct option is C Arachanids
Book lungs are organs of gaseous exchange in arachanids, example spiders and scorpions. They consist of thin plate like structures, which appear like the pages of a book. The plates are filled with haemolymph which facilitates exchange of gases between the organism and the environment. They are present within small openings of the abdomen.