Correct Answer: Option D

Explanation

Digestion in mammals breaks down food into nutrients that the body uses for energy, growth, and repair. 

How digestion works 

1. Ingestion: Food is taken in.
2. Mastication: Food is chewed and mixed with saliva.
3. Secretion: Digestive juices are released into the digestive tract.
4. Digestion: Food is broken down into smaller molecules.
5. Absorption: Nutrients, water, vitamins, and electrolytes are absorbed into the bloodstream.
6. Evacuation: Waste products are eliminated.

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