According to cell theory, what is a fundamental characteristic of all living things?

The fundamental characteristic of all living things, according to cell theory, is that all living things are composed of cells. Cell theory asserts that all organisms, whether unicellular or multicellular, are made of one or more cells, which serve as the basic unit of life. This concept highlights the importance of cells in the structure and functioning of living organisms.

While some living things do have the ability to reproduce asexually, not all living organisms share this capability. Reproduction can occur through various methods, including sexual reproduction. Additionally, not all living organisms possess a nervous system; for example, plants and many microorganisms do not have one at all. Movement is also not a universal characteristic among living organisms, as many organisms, such as plants and certain unicellular organisms, may not exhibit independent movement. Therefore, the defining feature that applies to all living entities is their composition of cells, making it the cornerstone of cell theory.