Which one of the following is not a vertebrate?

Sea cow

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Sea lion

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Sea horse

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Sea hare

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Solution

The correct option is B Sea hare
Sea hare is commonly known as sea slug. They belong to the group molluscs. They are marine gastropods.
Sea cow belongs to the class Mammalia. Sea horse is a fish. Sea lions are also sea mammals.
Hence, except Sea hare, all three organisms belong to vertebrate phylum.
Thus, the correct answer is option D.

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