“No specific excretory organs are present in unicellular organisms”. Hence, the main excretion takes place by : 

“No specific excretory organs are present in unicellular organisms”. Hence, the main excretion takes place by : 

  1. A

    simple diffusion through body surface

  2. B

    through contractile vacuoles

  3. C

    osmosis through body surface

  4. D

    all the above

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