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Select the incorrect statements.
(a) Notochord is persistent throughout life in cyclostomes.
(b) Notochord is absent in hemichordates.
(c) Notochord is confined to the larval tail of all protochordates.
(d) Notochord is not replaced by the vertebral column in Osteicthyes.

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(b) and (d)

(a) and (b)

(b) and (c)

answer is C.

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Detailed Solution

(a) Notochord is persistent throughout life in cyclostomes.

(b) Notochord is absent in hemichordates.

(c) Notochord is present in the larval tail, only in urochordates. Protochordates include both cephalochordates and urochordates

(d) Notochord is not replaced by the vertebral column in chondricthyes (not osteicthyes).

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