Biology

The correct answer is B. All living organisms are composed of cells.

The fundamental principle of the cell theory is that all living organisms are composed of cells. This principle was established based on the observations and discoveries made by scientists such as Robert Hooke, Matthias Schleiden, and Theodor Schwann. It states that cells are the basic units of life and that all living things, from single-celled organisms to complex multicellular organisms, are made up of cells.

Option A, stating that eukaryotic cells are larger than prokaryotic cells, is not a fundamental principle of the cell theory. It is a statement regarding the size differences between dif...