1.The Carbon Cycle C02 Human activities Respiration Land Animals and plants microorganisms Aquatic plants and C02 Aquatic phyto- animals plankton Biological pump. Fossil←-Humus Death and C02 fuels mineralization - Soil formation Earth's crust Rock formation 2012 Pearson Education,Inc The carbon and oxygen cycles are closely connected,as oxygenic photosynthesis both removes CO2 and produces O2 while respiratory processes both produce CO2 and remove O2.碳循环与氧循环密切相关3 Microbiology, Shanghai Jiao Tong University 1. The Carbon Cycle The carbon and oxygen cycles are closely connected, as oxygenic photosynthesis both removes CO2 and produces O2 while respiratory processes both produce CO2 and remove O2.碳循环与氧循环密切相关