The graph shows the oxygen dissociation curves of haemoglobin from two species of mammals, s and T .

Which statements could explain the difference in the oxygen dissociation curves of species S and species T ?
I. Species T has higher haemoglobin concentration in its red blood cells than species S.
II. The haemoglobin in species T has a lower affinity for oxygen than the haemoglobin in species S.
III. Species T may be living at a higher altitudes than species S.

Options

A. I, and III only
B. II and III only
C. I,II and III
D. III only

Answer

C