The absence of excretory organs, greater power of regeneration and exclusively marine animals belong to the phylum:

Mollusca

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Echinodermata

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Pisces

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Arthropoda

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Solution

The correct option is B Echinodermata
Echinodermata is a phylum of marine animals. They are the largest phylum that has no freshwater or terrestrial representatives. The excretory system is absent in Echinodermata and they possess a high regeneration power. They have water vascular system through which they take dissolved food. The channels of the vascular system lie in the tube feet.
Therefore, the correct answer is option B.

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