Answer: Rudolf Virchow.
- A Rudolf Virchow
- B M.J. Schleiden
- C Theodor Schwann
- D Gregor Mendel
Correct answer: A. Rudolf Virchow
Explanation: Rudolf Virchow (1855) proposed that all cells arise from pre-existing cells, completing the cell theory of Schleiden and Schwann.
Animal cell structure with major organelles labeled. Image: LadyofHats (Mariana Ruiz), Public Domain, via Wikimedia Commons.
Concept context
Cell theory, prokaryotic vs eukaryotic cells, organelles and their functions. Foundation of all biology.