🥥what is excretion?

• Excretion

  getting rid of (not all) waste materials, only applying to ones that have been inside the body.
• Digestive System

  food eaten goes from the mouth to the anus through a tube is not part of a body.

  
  

  Only things that move out of the digestive system and into the person's blood or their body cells, are really part of the body.
• Waste

  waste from the digestive system (faeces uwu) does not count as excretion since it was never part of the body. 💩
• Excretion Includes

  all the waste substances that organisms make in their cells and any substances that they have too much of.
• Excretion Examples:

  1. carbon dioxide, (which the body cells make in respiration)
  2. urea, (made in liver cells)
  3. excess water that is not needed by the body