Final answer:
The 9 + 2 array found in flagella is made of microtubules, with nine microtubule doublets surrounding a pair of central microtubules.
Step-by-step explanation:
The cytoskeletal component that makes up the 9 + 2 array found in flagella is microtubules. This structure is key for the function of both flagella and cilia across a range of eukaryotic cells. The 9 + 2 arrangement refers to nine microtubule doublets that form a ring around a central pair of microtubules, allowing for flexibility and movement. The movement in these structures is driven by motor proteins, specifically dynein and kinesin, which slide the microtubules against each other.