The average human body is a functioning living type of species called "Homo Sapiens-Sapiens.". We have evolved from just tiny little things! All the way to the Present. The human body's largest organ is the skin. Located in our chest is our Lungs and Heart, Underneath is our Diaphragm. It moves in when we breathe in and moves out when we breathe out. Fun fact: If you take all the veins in your body out and put it in a single line, It can circle the earth more than 1 time and more than 2!