A digestive system with ____ is able to carry out various tasks of digestion at once.

A) bilateral symmetry
B) collar cells
C) a one-way tube, a mouth, and an anus
D) radula
E) a two way sac-like cavity

Bilateral Symmetry

A body plan in which an organism can be divided into two equal halves along a single plane, characteristic of many animals.

Radula

A unique anatomical feature found in mollusks, consisting of a chitinous ribbon-like structure used for feeding by scraping or cutting food.