Later some non-science person thought that the gas floated to the top of the atmosphere to form a layer like the glass in a greenhouse. The popular view is that the atmosphere has some sort of layer of carbon dioxide up there that reflects heat back down to Earth rather than letting it escape to space.
The function of the human arm is to be able to reach objects with your hands.he function of the arm in the microscope is to support the tube  and connects it to the base. It is also use to transport the  microscope from place to place. 2 people found this useful. Edit.
In human anatomy, the arm is the upper limb of the body, comprising regions between the glenohumeral joint (shoulder joint) and the elbow joint. In common usage the arm extends to the hand. It can be divided into the upper arm (brachium), the forearm (ante brachium), and the hand (manus). Anatomically the shoulder girdle with bones and corresponding muscles is by definition a part of the arm. The Latin term brachium may refer to both the arm as a whole or to the upper arm on its own.