Q.

Excretory structure is absent in

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a

Fasciola

b

Ascaris

c

Apis

d

Asterias

answer is D.

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Detailed Solution

Asterias (Echinodermata) has no specific excretory structures but tube feet help in it partly.Apis  (Terrestrial arthropods) - Malpighian tubules.Ascaris (Aschelminthes)  - Excretory tube removes body wastes from the body cavity through the excretory pore.Fasciola (Platyhelminthes) - Flame cells.
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