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Life processes are the processes essential for maintaining the life of an organism. Example - nutrition, respiration, transportation etc.

In chemistry, molecular movements refer to the peculiar, rapid, oscillatory movement of fine particles suspended in a fluid medium.

All living organisms are well organized structures. The ordered nature of living organism can break down over time due to the effects of the environment. If this order breaks down, the organism cannot survive. To repair and maintain the order of these structures, molecular movements are needed for life. Life runs on chemical reactions. Molecules have to come in contact with each other to react. Life's most basic forms and processes are finely adapted to exploit the random motion of molecules.