AP BIOLOGY

Detailed explanation-1: -Virchow is credited with several key discoveries. His most widely known scientific contribution is his cell theory, which built on the work of Theodor Schwann. He was one of the first to accept the work of Robert Remak, who showed that the origin of cells was the division of pre-existing cells.

Detailed explanation-2: -(a) Rudolf Virchow (1821–1902) popularized the cell theory in an 1855 essay entitled “Cellular Pathology.” (b) The idea that all cells originate from other cells was first published in 1852 by his contemporary and former colleague Robert Remak (1815–1865).

Detailed explanation-3: -Remak was nevertheless highly productive as a microscopist. His major contribution to cell theory was the evidence that new animal cells arise by binary fission of pre-existing cells.

Detailed explanation-4: -He demonstrated the existence of the medullary nerve sheath and its production in the process of structured cell division. Remak also was the first to demonstrate that the cerebral cortex consists of six layers and to assert that there are three germ layers in the early embryo and not four.

Detailed explanation-5: -Expert-Verified Answer Rudolf Virchow wanted to show that cells always come from other cells, which means that cells and living organisms cannot come from non-matter or dead matter.