u have a digestive system to digest food or change it to usable substances your body can use
Use this system to chew and swallow
the digestive system
http://wiki.answers.com/FAQ/6462excretory
cells
The intestines.
The answer would be the digestive system.
we use the digestive system as an aid in breaking down big foods into smaller particles which provide energy to our body :))
The purpose of the digestive system is to break down food to make it absorbable into the bloodstream.
use food
The digestive system, the circulatory system, the respiratory system, and finally the excretory system
to make sure the turd comes out right