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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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