First slide
Classification of Animals
Question

Excretory structure is absent in

Easy
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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