1. All living organisms are composed of one or more cells. This means that every living thing, from the smallest bacteria to the largest whale, is made up of cells.

2. The cell is the basic unit of life. This means that cells are the smallest unit of life that can carry out all of the functions necessary for life.

3. All cells arise from pre-existing cells. This means that new cells are not spontaneously generated, but instead are formed by the division of existing cells.

These three points are the foundation of modern biology and help us understand the fundamental nature of life.