A level Biology: Post your doubts here!

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Yoooo,quick question
how do we write about dilutions in paper five
Like suppose if they ask to write about preparation of diff. Concentrations by serial dilutions or by proportional?
Like can someone in short help me out?with both the dilutions
 
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I was asking about the 4 mark part where you had to explain how the technician gets the number of sperms? how much did you get i think i got 336000 or 336000 i dont remember which one it was
 
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