Which of the following is NOT a principle included in the modern cell theory? A. New cells are formed only by division of a preexisting cell B. The cell is the basic unit of structure and function for all organisms C. Living cells appear spontaneously from nonliving matter D. All living things are composed of one or more cells

Eukaryotic cells are theorized to have evolved from prokaryotes called the endosymbiotic theory. this explains that the most primitive eukaryotic cell engulfed a prokaryotic cell (by the process of phagocytosis) that is capable of cellular respiration and another prokaryotic cell that is capable of photosynthesis. these prokaryotic cells eventually became organelles and these organelles are the mitochondria and the chloroplast