The Impact of Life on Biogeochemical Cycles

Organisms are involved in many transformations that have important environmental consequences. The activities of microbes are especially 

The major reservoirs of water on Earth are the oceans. The hydrologic cycle is driven primarily by evaporation of water from the oceans, lakes. 

Cycle Process (chemical transformation) Biological group responsible 

Carbon Carbon dioxide fixation (CO2 organic Photosynthetic organisms plants, algae. 

Nitrogen Nitrogen fixation [N2 - - RNH2 some amino Free living prokaryotes Azotobacter (organic 

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