3. In 1839, Matthias Schleiden, a German botanist, published research showing that a cell's nucleus plays a part in its reproduction. In 1858, Rudolf Virchow, a German biologist, published research showing that all cells come from preexisting cells. Which of the following bestdescribes how the two scientists' discoveries influenced cell theory?A. The two scientists' discoveries helped cell theory become more accurate. B. The two scientists' discoveries helped to simplify cell theory. C. The two scientists' discoveries helped to complicate future discoveries. D. The two scientists' discoveries helpedto debunk cell theory