Chewing, biting, mashing, tearing, grinding, etc. action is a physical change in digestion.
What do you mean by physical change?
- "Physical changes are changes affecting the form of a chemical substance, but not its chemical composition."
What is digestion?
- "Digestion is a process of breakdown of complex food substance into simple ones in order to get nutrients."
- Digestion starts from the mouth where the food is crushed, mashed and mixed to form bolus.
- The churning movement of esophagus push bolus into stomach.
- The digestion ends in large intestine.
Hence, the answers are: chewing, grinding, mashing and tearing.
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