Answer:
Chromosomes are copied during the replication process.
Step-by-step explanation:
According to the part of the cell theory proposed in 1838, cells come from already pre-existing cells. This means that a new cell arises from an old cell. The way by which this occurrs is between CELL DIVISION.
In cell division, like Mitosis and meiosis, new cells result as a result of the division of nucleus and cytoplasm of the cell. Therefore, Chromosomes are copied during the replication process best describes the idea of cell theory that cells arise from already existing cells.