The Carbon Cycle CO2 in atmosphere Burning Plants,algae, cyanobacteria Plant Animal Fixation respiration respiration Wood and fossil fuels Consumption CH4+CO2 Plants Animals Dissolved Decomposition C02 Photosynthesis Soil and Dead 介 water microbes organisms Aquatic Plants,algae, bacteria cyanobacteria 7 Fossil Dead organisms fuels cudingaquatic anim Figure 27.3 The Carbon Cycle Figure 27.3