Question

Why are molecular movement needed for life? Explain it in simple way...

Answer 1

Molecular movements are very necessary to provide the different kinds of Molecules through the entire body of the organism for maintaining and repairing the structure of the organism body.

Diffusion is the essentially the movement of molecules from the region to region in biology the movement of molecules throughout the body of the Organism is no dad is known as diffusion.

Answer 2

For repairing and maintaining the body.Molecular movements are the movements of various molecules from one place to another inside the cells and in between cells. These movements are not visible to naked eye, but play a very important role in all the life processes. They are necessary to carry out various metabolic reactions (like respiration,etc) as every body reaction requires movement of molecules and they are necessary for life.  

or    

because of the effect of the environment the organised nature of living organism keep breaking with time which will disturb the organism's structure and it will be no longer alive So to maintain ordered organised structure molecular movements are needed