Help..Bio paper 6

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hey what do we hve to learn in rbc wbc and platelets
and do we hve to knoe d excretory and respiratory system??
plzz reply fast
'You mite be told to describe or identify rbc wbc and platelets....Im nt sure about respiratory and excretory system..
Btw,in graphs..do we always have to draw best fit line?
 
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