Similarity between echinoderms and chordates is

Deuterostomatic tube-within-a-tube plan

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Protostomatic tube-within-a-tube plan

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Water vascular system

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Kidneys

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Solution

The correct option is A Deuterostomatic tube-within-a-tube plan
Echinoderms and chordates both show bilateral symmetry at any stage of their life cycle. Therefore, they belong to the clade Bilateria. Also, both are deuterostomes whose blastopore develops into the anus. And, both exhibit radial cleavage, which is indeterminate.
So, the correct option is A.

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