Answer the following question given this paragraph: 

To grow and develop, you must form new cells. Imagine how often your cells must divide during a growth spurt. Growing just an inch requires countless cell divisions. Your body must produce new bone cells, new skin cells, new cells in your blood vessels and so on.


Q: A growth spurt requires constant divisions of what?

 Choices:

- hairs

- seeds

- proteins

- cells

A:
cells
