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Q.

Which of the following characteristics is not shared by Petromyzon and Scoliodon?

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a

Circular mouth

b

Branchial respiration

c

Cartilaginous endoskeleton

d

Closed circulatory system

answer is D.

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Detailed Solution

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Circular mouth is the characteristic of cyclostomes (e.g., Petromyzon). The mouth is crescentic in Scoliodon (Chondrichthyes). 

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