Respuesta :

cupcakegirll

Answer:

its the brain!!!!!!!!

Explanation:

, the brain (and the nervous system that attaches to the brain) make up the most critical organ system in the human body

omarobaidullah

Answer:

Many people would think it's the heart, however, it's the brain.

Explanation:

While your heart is a vital organ, the brain (and the nervous system that attaches to the brain) make up the most critical organ system in the human body.