It is said that it's created by the lymph system. Hope you have a great day/evening/afternoon/night! :)
your answer should be a. I had this question not that long ago and I got it right
Answer:
Both are made of microtubules
Explanation:
Cilia and flagella are locomotory projections on a cell covered by plasma membrane. They are both made of microtubules. They are designed to move the entire cell or move substances. In the respiratory epithelium, the free end of the cells has hair-like structures called cilia which propel mucus and dust particles along it.