The digestion of food includes the mechanical actions of:

Peristalsis moves food through the digestive system with alternating waves of muscle contraction and relaxation. Digestion includes both mechanical and chemical processes. Mechanical digestion is a purely physical process that does not change the chemical nature of the food.

Digestion of food is a process which starts from mouth and continuous till intestine. The mechanical process which are involved is movement of tongue, chewing through teeth, peristalsis, etc.

Explanation:

Digestive system of a body includes mouth, food pipe, stomach, intestine. This system breaks down the food that a person eats into small particles which is helpful for conversion of food into energy. This energy is utilized by the body to perform different life functions.

The essential minerals and vitamins which are present in the food are absorbed in intestine. When we eat food, the food gets mixed with saliva which is present in our mouth. This mixing is necessary for the digestion of food.  

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.