Written Narration: It Couldn't Just Happen

There are many wonders of the human body, your heart pumps blood to all over your body through 75000 miles of blood vessels.  Blood cells die and "reproduce" everyday, and you don't even notice it happening.  Another interesting thing is the digestive system, it turns your food into nutrients that is absorbed in your body, your liver cleans your body.  And in the eyes, the rod sapped cells let you see black and white, while the cone-like ones let you see colors.