- The digestive system digests food for the body
- Digestion is when stomach acid breaks down food
- Therefore, 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
- So, 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
- So, 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
- So, 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
- Therefore, the digestive system breaks down food into nutrients for the body

Hence, the digestive system breaks down food into nutrients for the body
Question
Which of the following systems breaks food into nutrients that can be used by the body?

Context
- The digestive system digests food for the body 
- 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 
- Digestion is when stomach acid breaks down food 
- A body is a part of a living thing 
- Food contains nutrients for living things