Q: Which theory states that all organisms are composed of one or more cells, the cell is the basic unit of life, and new cells arise from existing cells?


Read this paragraph and choose the correct option from the provided answers:

CHAPTER SUMMARY 3.1 How Cells Are Studied A cell is the smallest unit of life. Most cells are so small that they cannot be viewed with the naked eye. Therefore, scientists must use microscopes to study cells. Electron microscopes provide higher magnification, higher resolution, and more detail than light microscopes. The unified cell theory states that all organisms are composed of one or more cells, the cell is the basic unit of life, and new cells arise from existing cells.

 Choices:

- theory of evolution

- microcellular theory

- natural selection

- unified cell theory


A:
unified cell theory