1. All living organisms are composed of one or more cells. This means that all living things are made up of cells, from the simplest bacteria to complex animals.

2. The cell is the basic unit of structure and organization in organisms. This means that cells are the fundamental building blocks of life and all living functions occur within cells.

3. All cells arise from pre-existing cells. This means that new cells are not created spontaneously, but are always produced by the division of existing cells.