During mitosis, the main focus is on the replication of chromosomes, which occurs during the S phase of the cell cycle prior to mitosis. However, synthesizing and preparing for division involves various components.
If we are strictly talking about what is replicated specifically during mitosis, the most relevant response is cells, as mitosis is the process by which one cell divides to form two genetically identical daughter cells.
So, the best answer to your question is: cells.
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