sentences: digestion is when stomach acid breaks down food & the digestive system digests food for the body ->  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 substance that 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 substance that it contains & food contains nutrients for a living thing's body ->  the digestive system breaks down food into nutrients for the body  nutrients are simpler than food & nutrients are a kind of substance ->  nutrients are a kind of simple substance  the digestive system breaks down food into nutrients for the body & nutrients are a kind of simple substance -> the breaking down of food into simple substances occurs in the digestive system