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A level Biology: Post your doubts here!

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Btw if anyone has done papers before 2013 so plz post the tricky qs....would be a great help :)
 
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THIS QUESTION ONLY FOR INNOVATIVE!.
Which gases shares binding site when bind with hemoglobin
1:CO2
2;CO
3;O2
lets see how smart you are.Q pretty ez tho
 
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