Describing the Function and Structure of the Nervous System What is the function of the nervous system? What is the basic unit of the nervous system?

b because they naturally adapt to their environment plz mark brainliest

explanation:

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.