Which best describes the importance of mitosis to living organisms?

The answer is Growth and Development

through mitosis, our cells growth from cells without specific function into the one who got a special functions in our body, such as brain cells, blood cells, the cells in your heart, etc

Mitosis is necessary for cellular repair and growth of cell tissues in organisms. Without this an organism will not be able to reproduce and heal itself. This is the process in which the cell divides to create new cells that are supported through the different phases of cellular division.