absorption are two important functions for the body to acquire energy and maintain life. among them, the digestive system is to digest and decompose the food in the body, and further absorb and process the food and make them become the substances of the body, which can be used by tissues of the whole...
absorption are two important functions for the body to acquire energy and maintain life. among them, the digestive system is to digest and decompose the food in the body, and further absorb and process the food and make them become the substances of the body, which can be used by tissues of the whole...