Are all living things composed of one cell?
All living things are composed of cells; but only microorganisms such as bacteria, paramecia and algae are unicellular (composed of just one cell).
the cell theory states that- 1.All living things are composed of cells. 2.Cells are the basic unit of structure and the function of living things. 3.All cells are produced from other cells. So, the cell theory says that all living things are made out of cells even what hte dog eeat is made of a dog.