Final answer:
Phoronids use a lophophore, a structure of ciliated tentacles, to filter and direct food into their mouths due to their sessile lifestyle.
Step-by-step explanation:
Phoronids, which belong to the clade Lophotrochozoa, feed using a specialized feeding structure known as a lophophore. This structure is composed of ciliated tentacles surrounding the mouth, which serves to capture and direct food particles into the mouth. The tentacles' cilia create water currents that help transport food particles towards the digestive opening. This mode of feeding is efficient for these sessile organisms, allowing them to filter and digest food particles from the water efficiently.