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Biology IA independent variable (and some help...)

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Hello everyone, I am currently writing my final draft for my Biology IA but I noticed that there is a roadblock ahead in my progress.

From what I have found online the independent variable needs to be quantitative but for my IA my independent variables are using different chemicals and seeing how much E. coli can be killed. May I ask if this is still acceptable?

Many thanks for your assistance!

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