Question

choose the best idea to add to a summary of \brains in command.\ for most animals, including humans, the brain is very important because it tells the body what to do. the brain controls the body by sending messages through the nervous system. messages from the brain tell the body how and when to breathe, move, and perform other bodily functions. disease, injury, or illness can damage the brain and nervous system. changes to the nervous system can have harmful effects on a persons or animals health. doctors are often able to help people who have damaged their nervous systems.

Explanation:

The passage focuses on the brain's importance and its control - function over the body, as well as how it can be damaged. The first option about the brain's importance and control is most central to the overall theme. The other options about doctors helping damaged nervous systems are more tangential.

Answer:

For most animals, including humans, the brain is very important because it tells the body what to do.