Scheiden and Schwann stated what important principle of biology, equal in weight to the Atomic theory of chemistry? A. That bacteria are single celled organisms.

B. That plants and animals are all composed of cells.

C. All of these

D. That multicelled organisms arose from symbiosis between single celled organisms.

B

Explanation:

Matthias Jacob Schleiden was a German botanist who, with Theodor Schwann, cofounded the cell theory. In 1838 Schleiden defined the cell as the basic unit of plant structure, and a year later Schwann defined the cell as the basic unit of animal structure.

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