F3IS about chewing plz help 急!

Chewing is both a part of digestion or ingestion. Chewing may always be regarded as physical digestion, however it can also chemically digest the food.

Ingestion simply means the consumption of substance by any living organism. As the food (the substance) will be gone after human intook the food, chewed and swallowed it, this is what we regarded as ingestion.

Digestion means the breakdowing of substance in order for our body to absorb the nutrient. Chewing is also a part of digestion, as chewing will increase the surface area of food and also allowed enzymes in saliva to start to chemically break down the food. The food will be transform to a form what we called bolus before we actually swallow it. The more formal and scienticfic naming of the chewing process is mastication.

Is chewing digestion or ingestion?
Chewing is first part of the digestive processes and usually known as the mastication.
IS book says that Ingestion is the intake of food, chewing and swallowing.
However, chewing is also regarded as physical digestion.
Yes, It means taking by mouth; eating ; drinking. Regarding chewing, that is already answered on the above question.