IB Biology and Chemistry IA Watch

Mirai98
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Hey guys, for my IA in biology, so I chose "How does change in length of holding breath affect blood pressure?" as research question. I'd like you to fill me with some answers to these, and maybe and idea of what kind of experiment I should carry and the controlled, independent and dependent variables that it'll help me to build up my reasoning. Also for those taking chemistry I'd like the same thing but with topic "Investigating the qualitative effect of changes of pressure on equilibrium " Thanks!
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