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Question 1 of 50
What are the three main principles of the Cell Theory?
A. All life is made of cells; cells are the basic unit of structure and function; all cells come from other cells.
B. Cells are the building blocks of life; all cells have a nucleus; all cells reproduce.
C. Organisms are made of cells; cells are the smallest unit of life; cells contain genetic material.
D. All organisms are composed of cells; cells are the smallest living things; cells arise only from pre-existing cells.