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BOD as a biology IA

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Hey guys,

I recently found out my old IA's method wouldn't work....

So I thought of a few ideas, one of which was perhaps using Biochemical Oxygen Demand as a Bio IA. The worry is that there will be too much chemical analysis rather than dealing with organic material. 

Another idea was to study yeast activity with altering amounts of salt. I know yeast is studied a lot, and also that it is too simplistic: I will just be varying salt and measuring CO2 released. 

I need some suggestions.

Thankss

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