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Option 4 : Both 2 and 3

  • The loss of water from the human skin occurs through two routes - evaporation and sweating. 
  • In the case of hot weather, around 4 litres of water per hour can be lost due to these two mechanisms. 
  • Evaporation is the process of changing of a liquid into gas phase when it heats up.
  • Sweating is a process of secretion of fluids by the sweat glands from the skin.
  • Diffusion occurs when a substance moves from an area of high to low concentration.
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