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Who introduced the concept that all living beings are made up of cells, known as cell theory?

1. Schleiden and Schwann introduced the cell theory.
2. The cell theory explains that all organisms are made of cells.
3. The cell theory is alternatively called the cell principle.
4. Another name for the cell theory is the cell doctrine.

Correct answer: Schleiden and Schwann introduced the cell theory.

Solution

The question asks about the proposers of cell theory, which was indeed proposed by Schleiden and Schwann in 1839. The other options are descriptive statements about cell theory but do not directly address its proposers.

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