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What was Rudolf Virchow's contribution to the cell theory? A. He concluded that all cells come from preexisting cells. B. He concluded that cells are the basic units of structure and function of all living things.
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Step 1:
I'll solve this problem by providing a clear, step-by-step explanation of Rudolf Virchow's contribution to cell theory.

Step 2:
: Understanding Cell Theory Background

Rudolf Virchow was a prominent German physician and pathologist who made significant contributions to cell theory in the mid- 19th century. Cell theory was developing during this period, with multiple scientists contributing key insights.

Step 3:
: Analyzing Virchow's Specific Contribution

Virchow's most important contribution to cell theory was the principle "Omnis cellula e cellula", which translates to "All cells come from preexisting cells". This was a crucial advancement in understanding cellular reproduction and origin.

Step 4:
: Comparing the Given Options

Option A: "He concluded that all cells come from preexisting cells" - This is EXACTLY Virchow's contribution. Option B: While important, this statement describes an earlier part of cell theory developed by Schleiden and Schwann, not Virchow's specific contribution.

Step 5:
: Contextualizing the Contribution

Virchow's statement completed the cell theory by explaining how cells actually reproduce. Previous scientists had established that: - Cells are the basic unit of life - All living things are composed of cells But they had not yet explained how cells themselves originate.

Final Answer

He concluded that all cells come from preexisting cells. This principle fundamentally explained cellular reproduction and was a critical advancement in understanding biological processes at the cellular level.