New cells generate from the pre-existing cells.
The cell theory is a widely accepted explanation of the relationship between cells and living things. The cell theory states :
• All living things or organisms are made of cells.
• New cells are created by old cells dividing into two.
• Cells are the basic building units of life.
In 1858, Rudolf Virchow concluded that all cells come from pre-existing cells, thus completing the classical cell theory.