Excretory system can not be observed in
hemichordate
Echinodermata
Chordata
Mollusca
Other:
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Answer:
Echinodermata
Explanation:
Excretory organs are lacking in starfish (Asteria). Excretory material includes ammonium compounds, urea and creatine, which are released to the outside either through dermal branchiae or engulfed by amoebocytes. Water vascular system also serves as excretory organ.
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