The careful observations of many scientists have resulted in the development of the cell theory. Which of the following is not part of this theory? (SC.912.L.14.1)

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1 point
a. All cells contain a nucleus.
b. All cells come from existing cells.
c. The cell is the basic unit of all living things.
d. All organisms are made up of one or more cells.

a. All cells contain a nucleus.