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.
Species is a group of population in which organisms have many common characteristics and they are capable of interbreeding and producing viable fertile offsprings. The members belonging to the same class and phylum have less common characteristics if they interbreed they may not produce viable fertile offsprings. Also, the organisms of the same kingdom have least common characteristics and will not have viable fertile offsprings after interbreeding.
