Which system includes organs between the mouth and anus?

The digestive system is the correct answer as it comprises a series of organs that work together to process food, beginning at the mouth and continuing all the way to the anus. This system includes not only the mouth but also the esophagus, stomach, small intestine, large intestine, and the anus. Its primary function is to break down food into nutrients that the body can absorb and utilize for energy, growth, and cell repair, while also eliminating waste.

Each of the other systems mentioned has different roles within the body. The respiratory system is responsible for gas exchange, primarily involving the lungs and airways, and does not include structures related to the intake or processing of food. The endocrine system is composed of glands that secrete hormones into the bloodstream to regulate various body functions, lacking any direct involvement with the digestive pathway. The skeletal system provides structural support and protection for the body and does not include organs associated with digestion. Thus, only the digestive system encompasses the full pathway from mouth to anus.