1. All living organisms are composed of one or more cells. This means that cells are the building blocks of all living things, from the simplest single-celled bacteria to complex multicellular organisms like humans.
2. The cell is the basic unit of structure and function in living organisms. This means that cells carry out all of the necessary life processes, such as metabolism, growth, and reproduction. Each cell is a self-contained unit that can function independently.
3. All cells arise from pre-existing cells. This means that new cells are not spontaneously generated, but rather come from the division of existing cells. This concept was established through experiments like those of Rudolf Virchow, who observed cell division.
These three concepts form the foundation of modern biology and have revolutionized our understanding of life.
