Echinoderms are headless, brainless and heartless. Yet, they are placed at the top of invertebrates, because of presence of

Enterocoel

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Solution

The correct option is A Enterocoel
Echinodermata is placed on the top of invertebrates, because of the presence of enterocoel. An enterocele is a coelom which is formed from the mesodermal sacs which are known to evaginate from the primary gut of the embryo to reach the body wall. This is the most common feature of echinoderms.
Therefore, the correct answer is option A.

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