The two correct answers that contribute to the frequency at which different cell types go through the cell cycle are:
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How frequently the cell is used - This affects how often certain cells need to divide to meet the demands of the tissue or organ they are part of.
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The location of the cell, which determines how often they need to be replaced - Different tissues have varying rates of cell turnover based on their function and the extent of wear and tear, influencing how frequently cells in those locations divide.
The other options (viscosity of the cell's cytoplasm and the length of the cell's endoplasmic reticulum) are not significant factors influencing cell cycle frequency.