The amino acid sequences of human and chimpanzee hemoglobin are almost identical, yet they differ considerably from the sequence of the hemoglobin of dogs. This fact:

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The high level of similarity between the hemoglobin sequences of humans and chimpanzees supports the theory of evolution which suggests that humans and chimpanzees share a common ancestor from which they evolved. The fact that dogs have a different hemoglobin sequence also reflects the evolutionary process as they evolved separately from humans and chimpanzees.

The Amino Acid Sequences of Human and Chimpanzee Hemoglobin Are