I. hairlike structure that acts primarily as an organelle of locomotion in the cells of many organisms

Answer 1

The hairlike structure you are referring to is called a flagellum. Flagella are long, whip-like appendages that protrude from the cell body and are primarily responsible for the movement of many single-celled organisms, including certain bacteria, protozoa, and sperm cells in animals. They work by rotating or beating in a coordinated manner, allowing the organism to propel itself through its environment. In addition to locomotion, flagella can also play a role in sensing the environment and facilitating the movement of substances across the cell surface.