Paper 1, May June 2008 | Cambridge AS - A Level Biology (9700) Past Papers
The graph shows the oxygen dissociation curves for haemoglobin from three different animals.
Which of the haemoglobins, X, Y or Z, would be present in each of the animals 1, 2 or 3?
1 an adult human
2 a fish living in water that has a very low oxygen concentration
3 a very active mammal whose tissues have a much higher rate of respiration than an adult human