Which of the following is not stated in the cell theory? a) Cells are the basic unit of structure and function in all living things. b) Animal cells are generally more complex than plant cells. c) All living things are composed of cells. d) All cells are produced from other cells.

Step 1: Define the Problem

Identify which statement is not part of the cell theory.

Step 2: Break Down the Problem

Examine each option to determine if it aligns with the principles of the cell theory.

Step 3: Apply Relevant Concepts

The cell theory traditionally includes the following principles:

1. All living things are composed of one or more cells.
2. The cell is the basic unit of structure and function in living organisms.
3. All cells arise from pre-existing cells.

Step 4: Analysis, Verify and Summarize

• Option a: "Cells are the basic unit of structure and function in all living things." This is a part of the cell theory.
• Option b: "Animal cells are generally more complex than plant cells." This is not a part of the cell theory; it is a comparative statement about cell complexity.
• Option c: "All living things are composed of cells." This is a part of the cell theory.
• Option d: "All cells are produced from other cells." This is a part of the cell theory.

Final Answer

b) Animal cells are generally more complex than plant cells.