The graph shows the oxygen dissociation curves of the pigments myoglobin and haemoglobin.
Using information contained in the graph, what is the comparison between haemoglobin and myoglobin at a partial pressure of oxygen of 2kPa?

1 )
haemoglobin combines with more oxygen than myoglobin
2 )
haemoglobin combines with oxygen when myoglobin releases oxygen
haemoglobin has a lower affinity for oxygen than myoglobin
4 )
haemoglobin has a saturation of 20% when myoglobin is fully saturated
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