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why is defecation NOT considered as excretion ?

Dear Udiasmi,
Sorry, in the first case the difference didn't go through properly. 
Here is the correct answer to your query:

Egestion or defecation 
  1. Discharge of undigested, leftover food from the gut.
  2. It takes place through anus and sometimes through mouth.
  3. It is a part of digestion.
  4. The matter that is egested is faeces.
Excretion
  1. Discharge of metabolic wastes.
  2. It takes place through urethra, skin or mouth.  
  3. It is a total separate life process.
  4. The materials that are excreted are sweat, urine or carbon dioxide.
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Hope it helps!
Thumbs up if it is correct.

Regards! 

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Defletion means to detach and excreate means to remove
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Dear Udiasmi,
Here is the answer to your query: Egestion or defecation  Excretion Discharge of undigested, leftover food from the gut. Discharge of metabolic wastes. It takes place through anus and sometimes through mouth. It takes place through urethra, skin or mouth.   It is a part of digestion. It is a total separate life process. The matter that is egested is faeces. The materials that are excreted are sweat, urine or carbon dioxide.
Hope it helps!
Thumbs up if it is correct.

Regards! 
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