What helps direct the water over the gills in a clam?

In clams, water is directed over the gills primarily through the action of cilia, tiny hair-like structures that line the gills. These cilia beat in a coordinated manner, creating water currents that draw water into the clam's mantle cavity. Additionally, the clam's siphons, which are specialized tubes, help to intake and expel water, further facilitating efficient filtration and respiration. This process allows the clam to extract oxygen and food particles from the water.