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Classification, species concept and phylogeny - biology

Does anyone know the answers to any of these questions? I really don't know please help! x

Table 2 contains selected taxa for five species of chordates, and differences in the amino acid sequences of the beta polypeptide of haemoglobin, compared with the human form. (Note that the Eutheria is the sub-class of placental mammals, whereas the Metatheria is the sub-class of pouched mammals, the marsupials.)
Table 2 Selected taxa for five species and features of their beta polypeptides
The beta polypeptide of human haemoglobin has 146 amino acids, in the same sequence in most humans. The beta polypeptide of dog haemoglobin has 15 amino acid differences from the predominant human form.

a) Using evolutionary theory, explain why 90% of the amino acid sequence of the beta polypeptide of human haemoglobin occurs in the beta polypeptide of dog haemoglobin?

b) Suggest a reason for the differences in the beta polypeptides of human and dog haemoglobin.

c) (i) Describe how the data in Table 2 show that the more of the selected taxa that a species shares with humans so the fewer differences there are between its beta polypeptide and that of humans.

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