Classification of Animals
Question
Notochord is persistent throughout life in
Moderate
Solution
Notochord is persistent throughout life in cephalochordates, e.g., Amphioxus (lancelet) and some vertebrates such as cyclostomes and cartilaginous fishes.
In most vertebrates (e.g., frogs and lizards), the embryonic notochord is replaced by a vertebral column in the adult.
In tunicaes (Urochordata), notochord is confined to larval tail (absent in adults).
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