__ of parasites has motility function Answer: square

The correct answer is: **Cilia**.<br /><br />Cilia-like structures present on the surface of certain cells, including some parasites. They play a crucial role in the motility function of these cells, allowing them to move and navigate through their environment. Cilia beat in coordinated waves, enabling the cell to propel itself or to move fluids around it. This motility function is essential for various processes such as feeding, reproduction, and avoiding host immune responses.