How many forms of digestion are there?

Four

Mechanical digestion: This type of digestion involves the physical breakdown of food into smaller pieces. This can be done by chewing, grinding, or crushing food.

Chemical digestion: This type of digestion involves the breakdown of food into smaller molecules by enzymes. Enzymes are proteins that catalyze specific chemical reactions, and they can be found in the saliva, stomach, and pancreas.

Absorption: This is the process by which nutrients from digested food are absorbed into the bloodstream. Absorption takes place in the small intestine, where the walls of the intestine are lined with tiny villi. Villi are finger-like projections that increase the surface area of the intestine, and they contain blood vessels that absorb nutrients.

Egestion: This is the process by which undigested food and waste products are removed from the body. Egestion occurs through the rectum and anus.