Which of the following statements is / are not true? 1. In Urochordata, notochord is present onl...

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Which of the following statements is / are not true?
1. In Urochordata, notochord is present only in larval tail
2. In Cephalochordata, notochord extends from head to tail region
3. Branchiostoma belongs to Hemichordata
4. Only one class of living members, class Cyclostomata represents the agnathans
(a) 1,2 and 4 only
(b) 3,4 and 1 only
(c) 3 only
(d) 1 and 4 only
(e) 3 and 4 only
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