Which scientist had been studying animals and realized that all the different parts of animals were made of cells? A. Robert Remak
B. Rudolf Virchow
C. Theodor Schwann
D. Matthias Schleiden

Meanwhile, Theodor Schwann had been studying animals and realized that all the different parts of animals were made of cells. These cells also had a nucleus! The two combined their ideas and developed the first two tenets of the cell theory.

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