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WHAT IS  EXCRETION?
Excretion  is the process of eliminating waste products of metabolism and other non-useful materials. It is an essential process in all forms of life. It contrasts secretion, where the substance may have specific tasks after leaving the cell.
WHAT IS H2O ?
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Maria original

  • 1.  
  • 2. WHAT IS EXCRETION?
  • 3. Excretion is the process of eliminating waste products of metabolism and other non-useful materials. It is an essential process in all forms of life. It contrasts secretion, where the substance may have specific tasks after leaving the cell.
  • 5.
  • 6.
  • 7.
  • 8.