LIFE SCIENCE

Detailed explanation-1: -Theodor Schwann, a German zoologist, discovered that all animals were composed of cells.

Detailed explanation-2: -In 1838, German scientist Matthias Schleiden concluded that all plants are made of cells. The next year Theodor Schwann, another German, concluded that all animals were also made of cells.

Detailed explanation-3: -The classical cell theory was proposed by Theodor Schwann in 1839. There are three parts to this theory. The first part states that all organisms are made of cells. The second part states that cells are the basic units of life.

Detailed explanation-4: -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-5: -Schwann graduated with an M.D. degree in medicine from the University of Berlin in 1834. He did his thesis work in 1833-1834, with Müller as his advisor. Schwann’s thesis involved a careful study of the necessity for oxygen during the embryonic development of the chicken.