I. carbon- oxygen cycle
1. what 4 organic compounds is carbon found in?
2. carbon dioxide comprises approximately what percent of tropospheric gases?
3. how is the relative amount (%) of co2 significant in contributing to the earth’s “natural
thermostat”?
4. identify the two processes which have the greatest influence on tropospheric
concentrations of co2 on a monthly or yearly basis.
5. name the two largest sinks (storage areas) for carbon.
6. discuss how oceans play a major role in regulating co2 levels in the trophosphere
7. describe the two major anthropogenic interventions in the carbon cycle

After frida stops exercising, she continues to breathe heavily. what is most likely occurring in her body? heavy breathing during exercise has produced an oxygen surplus in her muscles. this oxygen is being transported to her lungs. this is a result of aerobic respiration. heavy breathing during exercise has produced a carbon dioxide surplus in her muscles. lactate is being transported to her liver. this is a result of aerobic respiration. strenuous exercise has caused her body to be in carbon dioxide debt, and she is breathing hard while lactate is transported to the liver. this is a result of anaerobic respiration. strenuous exercise has caused her body to be in oxygen debt, and she is breathing hard while lactate is transported to the liver. this is a result of anaerobic respiration.