Which is not a vertebrate?

Fish

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Amphioxus

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Oryctolagus

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Sparrow

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Solution

The correct option is A Amphioxus
Amphioxus is not a vertebrate. It is Cephalochordata which is included in Phylum Chordata. Cephalochordates possess notochord that extends from head to tail and is persistent throughout their life.
While in vertebrates, the notochord is replaced by the vertebral column. Fish, Oryctolagus, and Sparrow are vertebrates as they are included in classes Pisces, Mammalia and Aves respectively.
Hence 'Amphioxus' is the right answer.

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