Answer:
Motile cilia and flagella
Explanation:
Both motile cilia and flagella consist of a central bundle of microtubule that is known as axoneme. The axoneme consists of nine doublets microtubules that surround a pair of the central single microtubules. This arrangement of microtubules in the cross secretion of flagella and motile cilia is called 9+2 arrangement.
Each of the 9 doublet microtubules consists of A and B tubules. Additional accessory proteins are associated with the 9+2 microtubules to make then stiff and elastic.
