The trachea is a tube that carries air inside the lungs.
<u>Answer </u>
kinetic
<u>Explanation</u>
Matter is anything that occupies space and has mass. There are four states of matter, solids, liquids, gases and plasma. All this consist of small molecules that are in constant random motion. This is called kinetic theory of matter.
When these molecules are in motion they may collide. No energy is gained or lost during collision. The particle/molecules move in a constant linear motion.