Here's why:

* Cell Division: Centrioles are involved in the formation of the spindle fibers, which are crucial for separating chromosomes during cell division (both mitosis and meiosis).

* Spindle Formation: Centrioles replicate and move to opposite poles of the cell during cell division. From these poles, microtubule fibers extend to form the spindle apparatus, which attaches to chromosomes and pulls them apart.

Let me know if you have any other questions!