Which of the following statements describes a key component of the cell theory?

The statement that all living organisms are composed of cells is a fundamental principle of the cell theory. This theory emphasizes that cells are the basic unit of life, meaning that every organism, whether unicellular like bacteria or multicellular like humans, is made up of cells. This core idea underscores the biological understanding that cells are essential for the structure and function of all living organisms.

In contrast, while the capability for photosynthesis is a function of certain cells (like those in plants), not all cells can perform photosynthesis, making the first statement inaccurate. The third statement falsely suggests that only multicellular organisms consist of cells; in reality, unicellular organisms also fit this definition. Lastly, the notion that cells can originate from non-living materials contradicts the established concept that cells arise from pre-existing cells, which is another key aspect of the cell theory.