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An Intiative by Sri Chaitanya
a
Anopheles
b
Antedon
c
Aplysia
d
Ascidia
answer is B.
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Detailed Solution
An excretory system is absent in echinoderms, e.g., Antedon. Other animals have an excretory system:Anopheles (Arthropoda) – Malpighian tubules Aplysia (Mollusca) – MetanephridiaAscidia (Urochordata) – Neural gland, nephrocytes