Expert: Walter Hintz - 11/10/2006

Question
please answer this question
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Urgent
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what are the diffrences of excretion for animals, humans and plants
thanks  

Answer
Hi doha
Excretion refers to getting waste materials out of the organism so the methods depend upon the kind of living thing.  You mention animals , humans and plants. It is easiest with plants that only excrete CO2 through the leaves in woody plants.  Other plants like aquatic plants excrete CO2 by diffusion.
As to animals (humans are animals) All vertebrates have kidneys that excrete Nitrogen wastes and sweat glands that excrete through the skin. Invertebrates have specialized organs to do the job.  There are too many variations to consider here but you can google this information.  For example google excretion in earthworms and you will find out about it.