AP BIOLOGY

Detailed explanation-1: -His research led to the discovery of the cell that produces the myelin sheath that envelops the axon. In honor of his contribution, this was later eponymously named the Schwann cell [3, 7, 9]. He also found that during embryonic development individual cells unite to form the muscle fiber [10].

Detailed explanation-2: -Theodor Schwann is most famous for his role in the development of cell theory. Theodor Schwann was a German zoologist famous for his development of the cell theory, identification of pepsin, discovery of Schwann cells and his disproving of spontaneous generation.

Detailed explanation-3: -Schwann, Theodor (1810–82) A German physiologist who, in collaboration with M. J. Schleiden, proposed the cell theory (and coined the term), according to which all plant and animal tissues are composed of cells, and within an individual organism all the cells are identical (see also VIRCHOW, RUDOLF).

Detailed explanation-4: -Answer and Explanation: Theodor Schwann was the one who proposed that all animals are made up of cells., and that cells are the basic unit of structure and function of animals.