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a
Chondrichthyes and Osteichthyes
b
Urochordata and cephalochordata
c
Cephalochordata and Chondrichthyes
d
Cephalochordata and Hemichordata
answer is C.
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Detailed Solution
Notochord is persistent throughout life in Cephalochordata, Cyclostomata and Chondrichthyes.In urochordates, notochord is present only in the larval tail.