- the digestive system will bring various nutrients into the body. As the important material in the growth
.- respiratory gas to the cells into the body and get rid of the gas cells don't want out of the body. It also serves to generate the power to the cell. The cell can be used for the benefit of
.- blood circulation. The different substances useful to cells throughout the body. The substance doesn't want to get rid of the cell to the organ tissues outside the body
- digestive system, eliminate waste cells don't want out of the body.