Which of the following best explains how the cell theory was developed? Cells are so diverse that scientists had to come up with an explanation that would apply to all types of cells.

Mutations occur and cause changes in cells so scientists could not develop a law that would apply to all forms of cells.

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The cell theory is a well-tested explanation of observations that was formed from the contributions of several different scientists.

The cell theory was developed through extensive library research because it would be impossible to test all living things for the presence of cells.