Which set of statements correctly summarizes the three main ideas of the classical cell theory?

Introduction / Context:
This question focuses on the classical cell theory, one of the most fundamental frameworks in biology. The cell theory explains what cells are and why they are considered the basic units of life. A solid grasp of these core statements is essential for understanding all higher topics in cell biology, physiology, and even medicine.

Given Data / Assumptions:

• We are dealing with the classical cell theory, not extended modern additions.
• The three statements listed describe properties of cells in living organisms.
• We must determine whether each statement is part of the accepted cell theory.
• The options include an inclusive choice: all of the above.

Concept / Approach:
The classical cell theory has three key points: all living things are composed of cells, the cell is the basic structural and functional unit of life, and new cells arise only from preexisting cells. By comparing these accepted ideas to the statements given, we can decide if each one belongs to the theory and whether the combined answer should be all of the above.

Step-by-Step Solution:
Step 1: The first statement, that all living things are made up of cells, is a central component of cell theory and is correct.Step 2: The second statement, that new cells come from existing cells, reflects the principle that cells do not arise spontaneously but through cell division, which is also a core element of cell theory.Step 3: The third statement, that cells are the basic unit of structure and function in living things, expresses the idea that every tissue, organ, and system is ultimately composed of cells performing specific roles.Step 4: Since all three statements match the classical cell theory, the option that best summarizes the correct combination is all of the above.

Verification / Alternative check:
Many textbooks explicitly list the three points of cell theory in nearly identical wording. If you remember that there are three accepted statements and see three corresponding ideas in the answer choices, you can verify that the option combining them all is correct.

Why Other Options Are Wrong:
Each of the individual statements alone captures only part of the theory. Selecting just one underestimates the full scope of the concept. The cell theory is not complete without acknowledging that cells make up all living things, function as basic units, and originate from existing cells.

Common Pitfalls:
Students sometimes forget the third point about new cells arising from existing cells and may think the theory only concerns structure, not reproduction. Others may confuse modern additions, such as energy flow or genetic information, with the original three statements. It is important to distinguish the classical theory from later refinements.

Final Answer:
All three statements together describe the classical cell theory, so the correct choice is All of the above.