Which is an component of the modern cell theory that was not part of the original cell theory?

"All cells are similar in composition and metabolic activities."

Explanation:

Cell Theory is the key theory for the study of Cell Biology, as it refers to the cellular composition of living things. The cellular theory is composed by the ideas of Schwann, Schleiden and Virchow and was based on three basic ideas:

Schwann, Schleiden, and Virchow, however, believed that all cells were similar in composition and metabolic activity and included this idea in cell theory. However, over the years and the advancement of technology this thinking has been discredited and today, current cellular theory, asserts that not all cells are similar in composition or metabolic activity.

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