What Is the Advantage of Having Different Forms of Hemoglobin

Multiple Choice

What is the advantage of having different forms of hemoglobin?

A) Multiple forms allows for speciation.
B) The multiple forms all have the same function so that one can be mutated without affecting the individual.
C) There is no advantage because the forms arose by random chance.
D) The different forms are adapted to most efficiently carry oxygen in different stages of development.
E) The different forms are adapted to most efficiently carry oxygen in different climates.