Which option correctly lists the three basic parts of the cell theory?

• A. All living things are made of cells; cells can form only by chemical synthesis in the cytoplasm; energy production occurs only in chloroplasts.
• B. All living organisms are composed of one or more cells; the cell is the basic unit of structure and function in organisms; all cells arise from pre-existing cells.
• C. All cells contain a nucleus; all organisms are multicellular; all cells arise spontaneously from nonliving matter.
• D. Cells are the basic unit of life; heredity is carried only by proteins; all cells are identical in structure and function.

Answer: (B)