As a child, Alex was short for his age. But during his teenage years, his height increased and he surpassed most of his friends. What must have occured to create this growth spurt?

A. Cells in Alex's body underwent meiosis to create new tissue

B. Cells in Alex's body underwent mitosis to create new tissue

C. Cells in Alex's body produced haploid cells that formed new muscle

D. Cells in Alex's Body produced new tissue by budding

B. Cells in Alex's body underwent mitosis to create new tissue

Explanation:

Mitosis is the cell division that forms two genetically identical daughter cells from one parent cell. It occurs in somatic cells and is responsible for the growth and development of individuals.

Alex gained the height as the cells in tissues of his body underwent the mitosis and produced new daughter cells. Repeated cycles of mitosis added a large number of new cells to his body to form new tissues in his body parts and caused an increase in his height.