* 9 + 2 arrangement of microtubules: Both structures have a core of microtubules arranged in a specific pattern. There are nine pairs of microtubules arranged in a ring around a central pair. This arrangement is called the "9 + 2" structure.
* Basal body: Both cilia and flagella originate from a basal body, which is a structure that anchors them to the cell. The basal body is also structurally similar to a centriole.
* Dynein arms: These molecular motors are attached to the microtubules and use ATP to generate the force for movement.
* Plasma membrane: Both structures are covered by a plasma membrane, which is a continuation of the cell's plasma membrane.
These shared features indicate a common evolutionary origin and mechanism of movement.
