A) Chordata
B) Echinodermata
C) Annelida
D) Coelentrata
Correct Answer: B
Solution :
When irritated or when subjected to unfavorable conditions, many species of sea cucumbers cast out a part of their viscera by a strong muscular contraction that may either rupture the body wall or evert its contents through the anus or sometime mouth. The lost part regenerate again.
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