Class Pterobranchia
Identified number of class pterobranchia is:
15 species
20 species
32 species
21 species
20 species
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Pterobranchia ranges in size from:A. 0.1-5 mm
B. 0.5-5 mm
C. 0.7-6 mm
D. 0.9-10 mm
Member of class pterobranchia has:
A. U-shaped structure
B. X-shaped structure
C. Y-shaped structure
D. none of above
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