First slide
Classification of Animals
Question

Specialised excretory structures are absent in

Easy
Solution

Echinoderms are the organisms which do not have specific excretory structures. Excretory wastes diffuse out through respiratory surfaces (e.g., tube feet).

Arthropoda - Malpighian tubules

Platyhelminthes - Flame cells

Aschelminthes - Renette gland

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