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I'm stuck in may/june 2007 Biology practical Question 1. the graph part. :(
How do we decide the graph axes here? :%)
http://www.xtremepapers.me/CIE/index.ph ... _qp_31.pdf
In mark scheme it says transmission/arbitrary units on x-axis, lead nitrate/% on y-axis.
Why? Aren't we changing...
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