While cilia and flagella are involved in movement, they are not the major means of locomotion in multicellular organisms.

Here's why:

* Multicellular organisms have specialized systems for movement: These include muscles, bones, and joints in animals, and structures like roots, stems, and leaves in plants.

* Cilia and flagella have other functions: Cilia are primarily involved in moving fluids and particles, while flagella are used for movement in single-celled organisms and for transporting sperm in animals.

Therefore, cilia and flagella are not the primary means of locomotion in multicellular organisms.