Which of the following statement is correct? I. In Urochordates like Ascidia, Salpa, Doliolum no...

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Which of the following statement is correct?
I. In Urochordates like Ascidia, Salpa, Doliolum notochord is present in only larval tail.
II. In cephalochordates like Branchiostoma (Amphioxus or Lancelet) notochord extends from head to tail and is persistent throughout the life
III. All vertebrates are chordates but all chordates nore verates
IV. Notochord is replaced by vertebral column
(a) All are correct
(b) Only II and IV are correct
(c) All are wrong
(d) Only II is wrong
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