Cell theory was created in 1839 and finalized in the 1850s by several prominent scientists. The theory helped biologists move away from the theory of spontaneous generation. Which statements below accurately describe cell theory? [Select ALL that apply] All organisms are composed of cells. Cells in a group make up a tissue. Cells arise from pre-existing cells. Cells cannot survive individually. Both living and non-living things are composed of cells. Cells are the most basic unit of organization and structure for organisms.