Which statement reflects the contribution of the cell theory regarding the production of new cells?

The statement that new cells are produced from existing cells is a fundamental principle of cell theory, which serves as one of the cornerstones of modern biology. This concept emphasizes that all living organisms are composed of cells, and importantly, that cells arise from pre-existing cells through processes like cell division. This ensures the continuity of life, as it allows for growth, repair, and reproduction in living organisms. The idea that new cells come from existing ones highlights the dynamic nature of biological systems and underpins a wide array of biological processes, including tissue growth and regeneration.

In contrast, the other statements do not align with established scientific principles. The notion of new cells forming from energy misrepresents how cellular processes occur, as energy alone does not create cells without the necessary biological materials and cellular mechanisms. The spontaneous appearance of new cells is inconsistent with our understanding of biology, as all cells arise from existing cells. Lastly, the merging of different species to create new cells does not reflect how cellular reproduction works, as this would imply a level of genetic and cellular interchange that does not occur in the typical processes of cell division.