When analyzing the given graph showing the relationship between anaerobic respiration and temperature, it can be seen that at -20°C the amount of fermentation during anaerobic respiration is zero, as the temperature increases the amount of fermentation increases, until 35°C when fermentation is at 100%. Interestingly, as the temperature increases further, fermentation decreases until at 60°C it ceases once more. At Earth’s beginning it is thought that the earth was covered with active volcanoes and was very hot, consequently it would have been too hot for anaerobic respiration. Once the earth’s atmosphere had cooled to below 60°C (140°F) then I assume that anaerobic respiration would have gradually increased as there was thought to be little
