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What causes a cell to divide? What are the things on the outside that send signals?

User Mridula
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Mitosis. When Mitosis occurs in a cell, the DNA in the cell is transferred to the divided cell. 
User Kkurian
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mitosis causes a cell to divide. Cell walls(only in plant cells) or cell membranes are the things on the outside that send signals
User Kfir
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