Mitosis is the process where cell divided itself. The actual process occurs to keep the surface area : volume ratio constant for cell absorption, but it also repairs damaged cells. Babies tend to heal wounds and cuts quicker than adults because mitosis is much more active.
Cell theory is just a standard criteria for cells, photosynthesis is a process exclusive to plants on how they make food, and chromosomes are just DNA structures found in the nucleus.
The correct answer is Mitosis.
