the digestive system digests food for the body & digestion is when stomach acid breaks down food ->  the digestive system breaks down food  if something is made of something else then that something can be broken down into that something else & if something is made of something else then that something contains that something else ->  if something contains something else then that something can be broken down into that something else  the digestive system breaks down food & if something contains something else then that something can be broken down into that something else ->  the digestive system breaks down food into the substances it contains  a body is a part of a living thing & food contains nutrients for living things ->  food contains nutrients for a living thing's body  the digestive system breaks down food into the substances it contains & food contains nutrients for a living thing's body -> the digestive system breaks down food into nutrients for the body