1.

Mention the groups of animals where excretion fakes place through diffusion from body surface.

Answer»

1. In protozoans wastes are excreted by diffusion through body surface. 

2. Contractile vacuoles present in some protozoans are mainly concerned with the maintenance of osmotic and ionic balance. Excretion is mainly by diffusion. 

3. In sponges, coelenterates like Hydra, excretion takes place by diffusion.



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