The mouth is located in the center of the underside of the body.
Digestive enzymes are secreted from the mouth to begin external digestion.
The pharynx connects the mouth to the gastrovascular cavity.
This structure branches throughout the body allowing nutrients from food to reach all extremities.
Planaria eat living or dead small animals that they suck up with their muscular mouths.
Food passes from the mouth through the pharynx into the intestines where it is digested by the cells lining the intestines.
Answer : (a)