Final answer:
The digestive tract of sea squirts is in the shape of a tube, and the pharynx helps with food ingestion and egestion. The gastrovascular cavity is divided into chambers for nutrient absorption and mechanical support.
Step-by-step explanation:
The digestive tract of sea squirts, also known as tunicates, is in the shape of a tube. The pharynx, which is a muscular part of the digestive system, serves to ingest and egest food. It extends for up to two-thirds the length of the body before opening into the gastrovascular cavity. The gastrovascular cavity is divided into several chambers by longitudinal septa called mesenteries, which increase the surface area for nutrient absorption and provide mechanical support.