What do comets and asteroids have in common? They are made of ice.
They orbit the Sun.
They are made of metal debris.
They are at the center of the solar system.

b

Explanation:

it is

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.