Which of the following is the correct order of the five specific tasks accomplished by the digestive system?
a. ingestion, mechanical digestion, chemical digestion, absorption, and elimination
b. ingestion, chemical digestion, mechanical digestion, absorption, and elimination
c. ingestion, mechanical digestion, elimination, chemical digestion, and absorption
d. ingestion, chemical digestion, mechanical digestion, absorption, and elimination

Option A

Explanation:

The first stage in digestion is intake of food either liquid or solid

The second stage is mechanical digestion in which the solid food material is broken down into smaller digestible pieces through chewing. There is no change in the chemical properties of food

The third stage is the chemical digestion. In this stage, the food is digested chemically by action of bio –enzymes, hormones, temperature and pH.  

The next stage is absorption of nutrients in the blood through diffusion or absorption in the small intestine.  

The last stage is excretion in which undigested or waste food is excreted out through the rectum via large intestine.  

Hence, option A is correct

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