What is indicated by two species having similar amino acids in the hemoglobin protein?

The two species were Rhesus monkey and Human 
Hemoglobin protein is the iron containing protein found in the red blood cells which function by transporting oxygen through the blood stream from from the lungs to the tissues and it is important for survival. However, the  two species that have similar amino acids in the hemoglobin protein were Rhesus monkey and Human because they were not far from others.

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