- Digestive System It is a system where the nutrients are absorbed into the body. A key ingredient in the growth - respiratory gas into the cell, the cell body and get rid of unwanted gases out of the body. It also serves the energy to the cells. The cells can be used to benefit - the circulation to various substances that are beneficial to cells throughout the body. Cells and substances that do not want to get rid off to the excretory organs of the body - the digestive system, the cells do not want to waste out of the body.
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