Class Pterobranchia
Pterobranchia ranges in size from:
0.1-5 mm
0.5-5 mm
0.7-6 mm
0.9-10 mm
0.1-5 mm
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Identified number of class pterobranchia is:A. 15 species
B. 20 species
C. 32 species
D. 21 species
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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