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Q.

Jawed vertebrate in which the notochord is persistent throughout life is

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a

Petromyzon

b

Sphenodon

c

Scoliodon

d

Doliolum

answer is C.

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Detailed Solution

Scoliodon (Chondrichthyes) is a jawed vertebrate in which the notochord is persistent throughout life. 

Petromyzon (Cyclostomata) is a jawless vertebrate with persistent notochord. 

Doliolum is a non-vertebrate chordate where notochord is present in its larval tail. 

Sphenodon is a vertebrate where notochord is confined to embryonic stage.

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Jawed vertebrate in which the notochord is persistent throughout life is