Final answer:
Cell theory includes the statements that all organisms are made up of cells, cells are the basic living units in all organisms, and all cells originate from pre-existing cells.
Step-by-step explanation:
Three statements from the video 'Introduction to Cells: The Grand Cell Tour with the Amoeba Sisters' that are included in cell theory are:
- All organisms are composed of one or more cells.
- Cells are the basic living units of organization in all organisms.
- All cells come from other cells, supporting the idea that life continues through cellular reproduction.
Cell theory is foundational in understanding biology and the continuity of life. The unification of Schwann, Schleiden, and Virchow's ideas forms the core of this theory, which has been undisputed in the scientific community.