Which of the following is a connecting link between vertebrates and invertebrates?

Sphenodon

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Balanoglossus

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Crocodile

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Tadpole larva

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Solution

The correct option is B Balanoglossus
Balanoglossus is a connecting link between vertebrates and invertebrates. Balanoglossus belongs to the phylum hemichordata which was earlier considered as a sub-phylum of phylum chordata. But, now it is placed as a separate phylum under non-chordata because notochord and post-anal tail are absent in it.

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