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'Cell theory' was established by :...

'Cell theory' was established by :

A

Robert Brown

B

Rudolf Virchow

C

Robert Hooke

D

Schleiden and Schwann

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**Step-by-Step Solution:** 1. **Understanding the Question:** The question asks who established the 'cell theory.' This theory is fundamental in biology and explains the properties and functions of cells. 2. **Identifying Key Contributors:** The cell theory was primarily proposed by botanists Matthew Schleiden and Theodor Schwann in 1839. They outlined the foundational concepts of the theory. 3. **Key Points of Cell Theory:** - **First Point:** All living organisms are composed of cells. - **Second Point:** The cell is the smallest unit of life that can perform all life functions. 4. **Additional Contributions:** In 1855, Rudolf Virchow added to the cell theory by stating that all cells arise from pre-existing cells, encapsulated in the phrase "Omnis cellula e cellula." 5. **Conclusion:** The correct answer to the question is that the cell theory was established by Matthew Schleiden and Theodor Schwann. **Final Answer:** The cell theory was established by Matthew Schleiden and Theodor Schwann. ---
**Step-by-Step Solution:** 1. **Understanding the Question:** The question asks who established the 'cell theory.' This theory is fundamental in biology and explains the properties and functions of cells. 2. **Identifying Key Contributors:** The cell theory was primarily proposed by botanists Matthew Schleiden and Theodor Schwann in 1839. They outlined the foundational concepts of the theory. 3. **Key Points of Cell Theory:** - **First Point:** All living organisms are composed of cells. ...
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