Excretory system is absent in:

Annelida

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Arthropoda

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Echinodermata

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Hemichordata

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Solution

The correct option is C Echinodermata
Excretory system is absent in Echinodermata while Annelida, Arthropoda and Hemichordata have excretory system.

Excretion is done by nephridia in Annelida. It is done by malpighian tubules in Arthropoda while proboscis gland is used for excretion in Hemicordata.

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