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a
Malphigiam tubules
b
nephridia
c
proboscis glands
d
absent
answer is D.
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Detailed Solution
In echinoderms, special excretory organs are absent. Excretory wastes diffuse out through respiratory surfaces such as tube feet.Malpighian tubules - ArthropodaNephridia - AnnelidaProboscis gland - Hemichordata