The diagram below shows the processes which created life on Earth. The diagram shows three boxes. The first box is empty. The second box is labeled 'Combining of molecules to form complex chemical structures'. The third box is labeled 'Organization of molecules into living structures'. There are two arrows in the diagram. The first arrow points from the first box to the second box. The second arrow points from the second box to the third box.

Which of these labels best fits the empty cell in the diagram?

fusion of living molecules
creation of living molecules
formation of non-living molecules
splitting up of non living molecules