Which of the Following Have a Complete Gut, Including an Anus

Question

Which of the following have a complete gut, including an anus?
A) Sea anemones
B) Pogonophora
C) Vestimentifera
D) Acorn barnacles

Accepted Answer

Acorn barnacles have a complete gut, including an anus, which is a characteristic of more advanced invertebrates. Sea anemones, Pogonophora, and Vestimentifera have incomplete digestive systems, lacking an anus, where the mouth also serves as the exit for undigested material.