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A level Biology: Post your doubts here!

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Can you explain question and why answer is C?
Air being bubbled means oxygen is being supplied...the two graphs are same for 3 carbon means that energy is not req for it so it is taken by diffusion whereas the graph for 6 carbon has significantly dropped means that it is taken up by the use of oxygen ie by active transport
 
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Wdym by end.This is a online competitve esports game like overwatch.
I stopped playing because of A-levels.I was addicted to this game haha.
I was silver at first but I got so good with practice and learned the game in so depth that people used to be scared when they saw me ... :p :p
same i stopped playing watch dogs and The Last of Us because of exams:((
 
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