3. Each end of the magnet is called a ___ pole.
magnetic

The ends of a magnet are called its poles. One end is called the north pole, the other is called the south pole. ... Opposite poles attract each other, but similar poles repel. The Earth acts like a giant magnet

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.