During mitosis, the primary focus is on the replication and distribution of DNA chromosomes to ensure that each daughter cell receives an identical set of chromosomes. Therefore, the correct response regarding what replicates during mitosis is:
cells.
However, it's important to note that while cells as a whole undergo division, the specific material being duplicated and separated are the chromosomes (which are composed of DNA). If the emphasis is strictly on what is replicated, then it refers to the genetic material. But in the context of your options provided, "cells" is the overarching correct answer.
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