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Q.

Book-gills and book-lungs are the respiratory organs of some animals of the phylum

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a

Mollusca

b

Echinodermata

c

Arthropoda

d

Hemichordata

answer is C.

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Detailed Solution

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Book-gills (e.g., Limulus) and book-lungs (scorpion) are the respiratory organs met with in some members of the phylum Arthropoda.

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Book-gills and book-lungs are the respiratory organs of some animals of the phylum