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. the electricity that travels through the nervous system does not hurt the body.

Explanation:

A summary should include key - ideas. The importance of the brain in controlling the body and how it does so (by sending messages through the nervous system) are key concepts. The fact about electricity in the nervous system not hurting the body is a less central idea.

Answer:

The brain controls the body by sending messages through the nervous system.