Pick the odd one out. (understand)

The correct answer is: Bioremediation

• Bioremediation, filtration, decantation and distillation are purification processes
• Bioremediation is the process of reducing the toxic burden of the environment using biological agents such as plants and microbes. This is a biological method of purification.
• Distillation is the process of separating liquids with their difference in boiling points
• Filtration is the process of separating liquids from solids by passing through a filter membrane
• Decantation is the process of separating liquids from solids by removing the liquid layer that is present on top without disturbing of the solid layer that has settled at the bottom