Back Pain. Another area that might cause pain in left side is the upper and lower back area. Again this type of pain can come from an injury or a disease. The most common cause of sharp pain in left side or any area of the back is a disc problem. A disc problem can come from an injury of course.
Notice that photosynthesis and respiration are essentially the opposite of one another. Photosynthesis removes CO2 from the atmosphere and replaces it with O2. Respiration takes O2 from the atmosphere and replaces it with CO2. However, these processes are not in balance.
The carbon cycle. The amount of carbon dioxide in the atmosphere is controlled by the carbon cycle. Processes that remove carbon dioxide from the air: 1  photosynthesis [photosynthesis: The chemical change that occurs in the leaves of green plants. 2  It uses light energy to convert carbon dioxide and water into glucose.