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The diagram shows the effect of three different concentrations of carbon dioxide on the oxygen dissociation curve for human haemoglobin.

What effect does carbon dioxide have on haemoglobin?

1 ) 

it makes it less efficient at taking up oxygen and also less efficient at releasing it

2 ) 

it makes it less efficient at taking up oxygen and more efficient at releasing it

3 ) 

it makes it more efficient at taking up oxygen and also more efficient at releasing it

4 ) 

it makes it more efficient at taking up oxygen and less efficient at releasing it

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