The correct answer would be completely by mitosis.
Mitosis is a type of cell division in which a parent cell divides into two daughter cells each with the same type and number of chromosomes as present in the parent cell.
Before cell division, the cell undergoes growth and replicates or doubles its genome.
The process of mitosis is usually divided into four phases prophase, metaphase, anaphase, and telophase.
It helps in the growth and repair of the cells or tissues in multi-cellular organisms.
The answer would be substance Y because as the temperature is being increased the amount of substance that will dissolve in the water is decreasing. I hope this helped