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The revision section (BIOLOGY)

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See there's a chapter on heredity in our course. I cant find it anywhere in the revision section of xtremepapers!
 
Messages
385
Reaction score
954
Points
103
the only thing i dont get is in excretion. like when the cappiliries take all the nutrients back from collecting duct in the kidney, why doesnt it take the waste products back too? i mean diffusion is suppose to happen because the concentration of the waste products is lower in the cappiliries but higher in the collecting duct.
 
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