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All cell arise from cells....

All cell arise from _____ cells.

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**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks for the source from which all cells arise. This is a fundamental concept in cell biology. 2. **Historical Context**: The concept that all cells arise from other cells was significantly contributed to by German scientist Rudolf Virchow in 1855. 3. **Observation of Cell Division**: Virchow observed cells under a microscope and noted that they were dividing. This led him to conclude that new cells are produced from existing cells. ...
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