During mitosis, the primary focus is on the replication and distribution of chromosomes to ensure that two daughter cells receive identical genetic material. However, some other components, such as certain organelles and proteins, may also be involved indirectly during the cell cycle.
In terms of what specifically replicates during mitosis, the answer would be cells, as mitosis results in the division of a single parent cell into two identical daughter cells. However, it's important to clarify that the actual replication of DNA (chromosomes) occurs during the S phase of interphase, before mitosis begins.
If you're strictly looking for what replicates during the process of mitosis:
Answer: cells
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