What did Empedocles do?	Developed the theory of the four elements
What did Dumas and Boussingault say?	with a pepar the chemical and physiological balance o organic nature> beginning of biogeochemistry
Ferdinand Julius Cohn	Said that fungi and bacteria were responsible for breaking down the complex molecules made by plants in soils and releasing them to allow for a new cycle of plant uptake and growth.
Vladimir Vernadsky	Wrote Geochemistry and the biosphere > founders of biogeochem
Laurens baas	First attempt: defining environmentes in terms of a redox potential and pH
Alfred Redfield	Redfiel Ration C:N:P=106:16:1
Odum Brothers	Fundamentals of Ecology> ecosystem ecology and role of biogeochem cycles in ecology
Why is nitrogen important?	It makes up 78% of Earth's atmosphere volume, it is an essential element for living organisms It is found in amino acids, proteins and nucleic acids
Principal reservoirs of nitrogen?	Atmosphere Continental crust Oceaniccrust
Fick's law	Diffusion

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