The echinoderms are related to Chordata by their similarity in the development of:

Gut

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Nerve

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Coelom

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Heart

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Solution

The correct option is C Coelom
The coelom is the cavity inside the layer of the mesoderm. Coelom formation in echinoderms is enterocele. The coelom has been originated by the outgrowth from the archenteron. The coelom is developed from the pinching of the embryonic gut. This type is the same as in the case of chordates.
Therefore, the correct answer is option C.

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