Which aspect of the cell theory emphasizes that cells are the basic units of life?

The correct choice highlights that all living organisms are composed of cells, which underscores the principle that cells are fundamental building blocks of life. This aspect of the cell theory indicates that, whether unicellular or multicellular, every organism is made up of one or more cells, reinforcing the idea that cells serve as the basic unit of structure and organization in living things.

Understanding that all living organisms are made up of cells is crucial, as it establishes a universal framework for biological study. It signifies that any analysis of life and biological processes must involve an examination of cells, their functions, and their interactions. This concept forms the foundation for further exploration into how cells function, how they contribute to the characteristics of organisms, and how they play a role in the various life processes, such as growth, reproduction, and response to stimuli.