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 answer is d. Ingestion, digestion, absorption, elimination.

There are 4 phases of the digestive system function:
1. Ingestion - the process of the food entering the mouth. 
2. Digestion - the process of breaking the food into small particles.
3. Absorption - the process of the absorbing small food particles into the blood from the intestines.
4. Elimination - is the process of removing the waste out of the body.