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Bio HL IA possible topics?

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I need possible IA topics with experiments, I wanted to do something related to gel electrophoreses but i don't have a research question.

I'm also open to new topic suggestions. 

Thanks, in advance.

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Here are some options my teacher gave me:

Factors affecting enzymes
Factors affecting photosynthesis
Factors affecting respiration
Factors affecting blood pressure
Factors affecting reaction rates 
Factors affecting Germination
Factors affecting Transpiration 

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