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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 increasing carbon dioxide concentration have on haemoglobin?

1 ) 

It makes it less efficient at taking up oxygen and 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 less efficient at releasing it.

4 ) 

It makes it more efficient at taking up oxygen and more efficient at releasing it.

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