Here's why:

* Provides support for the cell: The cytoskeleton is a network of protein fibers that provides structural support and shape to the cell. It acts like the cell's internal scaffolding.

* Two subparts: The cytoskeleton is made up of three main types of protein filaments:

* Microtubules: These are long, hollow tubes made of tubulin protein. They are involved in cell division, movement of organelles, and maintaining cell shape.

* Microfilaments (actin filaments): These are thin, solid rods made of actin protein. They play a role in cell movement, muscle contraction, and maintaining cell shape.

* Intermediate filaments: These are fibrous proteins that provide structural support and help anchor organelles.

Let me know if you have any other questions!