Which part of the cell theory states that all living things are made of cells?

The assertion that all living things are made of cells is rooted in the first part of the cell theory. This foundational principle emphasizes that the cell is the basic unit of life, which means that every organism, whether unicellular or multicellular, consists of cells. This idea is essential in biology because it highlights the role of cells as the building blocks of all living organisms. By stating that all living things are composed of cells, this part of the cell theory establishes a crucial connection between the structural organization of life and its biological functions. Understanding this concept is vital for students as it lays the groundwork for more advanced topics in cell biology and the study of life.