Final answer:
Cilia are short, hair-like structures found on eukaryotic cells. They beat in a repetitive cycle of movements and have various functions such as locomotion and feeding. Cilia use a rapid, flexible, waving motion due to their shorter length.
Step-by-step explanation:
Cilia are short, hair-like structures found on eukaryotic cells, composed of microtubules in a 9+2 array. They beat in a repetitive cycle of movements, allowing them to perform various functions such as locomotion, feeding, and movement of extracellular particles. Cilia use a rapid, flexible, waving motion due to their shorter length.