Clam Digestive System: Understanding Complete Digestion

Clams have a complete digestive tract.

A complete digestive tract includes a mouth, esophagus, stomach, small intestine, large intestine, and anus. Clams have all of these structures, so they have a complete digestive tract.

In contrast, an incomplete digestive tract is missing one or more of these structures. For example, earthworms have a mouth, esophagus, crop, gizzard, and intestine, but they do not have a stomach or anus. Therefore, earthworms have an incomplete digestive tract.