Question

which protein filament is found in cilia and flagella? microfilament intermediate filament microtubules cytoskeleton

Explanation:

Cilia and flagella are composed of microtubules arranged in a 9 + 2 pattern. Microtubules are protein - based filaments. Microfilaments and intermediate filaments are not the main components of cilia and flagella, and the cytoskeleton is a broader term that includes microtubules among other elements but is not the specific filament asked for here.

Answer:

Microtubules