Mechanical digestion means breaking down food mechanically. By chewing and tearing with teeth, food breaks down into smaller parts and no enzymes are used.
What is the first step in mechanical digestion?
The complex pieces of food that are eaten have to be split into simpler particles that can be acted upon by different enzymes.
This is mechanical digestion, which starts in the mouth with chewing or mastication and continues with churning and combining actions in the stomach.
Thus, this could be the answer.
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