Cell theory or cell doctrine is based on some basic principles. Choose the description that best addresses these principles.
A. Cells are the smallest unit of living organisms, and new cells form from pre-existing cells by cell division.
B. All life is composed of two or more cells, the smallest unit of life are cells, and cell division from pre-existing cells is the only way cell continue to exist.
C. New cells come only from pre-existing cells by cell division.
D. All living organisms are composed of one or more cells, cells are the smallest units of life, and new cells come only from pre-existing cells by cell division.
E. All living things are composed of one or more cells.
Answer: D
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