A contemporary mollusk in which many of the ancestral characteristics remain is a(n)

Question

Quizplus · Accepted Answer

Chitons have a simple body plan that resembles the ancestral mollusk. They have a broad, elongated foot and a shell made of eight dorsal plates, which is similar to the primitive mantle of the ancestral mollusk. Chitons also lack some of the adaptations that other mollusks have evolved, such as a siphon for water intake and expulsion, and advanced radula for feeding.

A Contemporary Mollusk in Which Many of the Ancestral Characteristics