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IB Bio IA Idea

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Hey guys, I'm really struggling to narrow down my topic for my bio IA. The deadline to start testing is coming quickly and I have no idea. I know I want to do something with energy drinks but that's about it. Any suggestions?

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I am guessing that if you are wanting to investigate energy drinks, you would definitely have to narrow it down to a specific problem/aspect of them i.e affect on cardiovascular and respiratory system. 

However, you definitely run the risk of not having an experiment that is viable for an IA if you do not design it well enough. Also, you would want some measurable IV which I don't think would be possible in your case. 

I quickly found this journal article on caffeine and bacteria growth which could provide as a source of inspiration. 

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I want my IA to do with the different kinds of foods with their pH level and how it affects the reaction rate of enzymes? make sense? if not, please correct me or any other suggestions or ideas would be very helpful. thank you!      

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