Class Pterobranchia
Member of class pterobranchia has:
U-shaped structure
X-shaped structure
Y-shaped structure
none of above
U-shaped structure
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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
Identified number of class pterobranchia is:
A. 15 species
B. 20 species
C. 32 species
D. 21 species
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