Which structure in zooflagellates aids in movement?

In zooflagellates, flagella are the primary structures that facilitate movement. Flagella are long, whip-like appendages that can rotate or undulate, allowing these unicellular organisms to swim through their aquatic environments. The motion generated by flagella is efficient for locomotion, enabling zooflagellates to navigate to food sources or escape from threats.

Pseudopodia, while associated with movement in some organisms, are more characteristic of amoeboid movement where the cell alters its shape. Cilia are short, hair-like structures that can also aid in locomotion and are used by other types of protists, but in zooflagellates, flagella are the defining feature for movement. The cell wall, typically present in various organisms for structural support and protection, does not contribute to mobility. Therefore, in the context of zooflagellates, flagella are the specific structure that directly aids in their movement.