1. All living organisms are composed of one or more cells. This means that all living things are made up of cells, whether it's a single-celled bacterium or a complex human being.
2. The cell is the basic unit of structure and organization in organisms. This means that cells are the smallest unit that can carry out all the functions of life.
3. All cells arise from pre-existing cells. This means that cells do not spontaneously generate, but instead come from the division of other cells.
4. Cells contain hereditary information (DNA) which is passed from cell to cell during cell division. This means that the instructions for building and maintaining a cell are encoded in its DNA, and this DNA is passed on to new cells when they divide.
These four points form the foundation of our understanding of biology.
