1.

How does excretion take place in phylum protozoa?

Answer»

1. Specific excretory organs are absent in unicellular organisms. These organisms remove waste products by simple diffusion from the body surface into the surrounding water. 

2. Excess water is sent out through contractile vacuoles in fresh water protozoans. Ex: Amoeba surface. 

3. The major portion of excess water is eliminated by diffusion through body surface.



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