Which of the following best sequences the functions of the digestive system from start to finish?
a. ingestion, absorption, digestion, elimination
b. absorption, ingestion, digestion, elimination
c. elimination, absorption, ingestion, digestion
d. ingestion, digestion, absorption, elimination

The correct answer is D. Ingestion, digestion, absorption, elimination.

Explanation-

Digestive system is an example of organ system, which acts upon the food (taken in by the organism) with the help of physical and chemical means so as to provide absorbable nutrients to meet the demands of the body.

In mammals, the digestive system includes the alimentary canal, which begins from mouth and ends with anus.

Food is first ingested by the mouth, then it is digested by different organs like mouth, stomach, and finally small intestine. The digested food is absorbed in the small intestine and the undigested food is eliminated from the body via anus in the form of fecal matter.

Thus, option D) is the best sequence of the function that digestive system performs.