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.
Cardiovascular System of the Arm and Hand. The cardiovascular system of the upper limbs plays the vital role of ensuring the adequate flow of blood to and from the shoulders, arms, hands and fingers. Adequate flow of oxygenated blood to the tissues of the upper limbs is critical to their health through the delivery of oxygen, water, and nutrients. Blood flow also helps to regulate body temperature in this region and reduces the risk of frostbite of the fingers in extreme weather conditions.