The illustration below shows several oxygen-dissociation cur…

The illustration below shows several oxygen-dissociation curves for hemoglobin. Assume that curve 3 corresponds to hemoglobin with physiological concentrations of CO2 and 2,3-BPG at pH 7. Which curves (chose the curve number that best fits) represent each of the following perturbations?    a)  Decrease in CO2 [answer1]b)  Increase in 2,3-BPG [answer2]c)  Increase in pH [answer3]d)  Loss of quaternary structure [answer4]