Compare the appearance and function of cilia and microvilli

The main difference is motility and composition.

Explanation:

Cilia are structures involved in movement and therefore there's a strong nervous connection with the inside of the cell. Otherwise, microvilli are mainly used to increase absorption and they're also thinner and shorter.

Another great difference is the composition. Cilia are made up of microtubules, while microvilli is made up of microfilaments.