The graph shows changes in percentage saturation of haemoglobin with oxygen in the blood of a human and of another animal. The partial pressure of carbon dioxide remains constant at 1.0 kPa and the temperature is constant at ${25^ \circ }C$.
Which conclusion is supported by the graph?
1 )
At ${25^ \circ }C$ the affinity of haemoglobin for oxygen increases more in humans than in the animal.
2 )
Haemoglobin in the animal carries less oxygen than haemoglobin in the human.
Oxygen is more easily released from haemoglobin in animal muscle than in human muscle.
4 )
The Bohr effect in the haemoglobin of the animal is greater than in human haemoglobin.
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