A phylogeny of human influenza virus samples from humans and a non-human host, swine, is shown below. The colors represent the locations of the samples. What is the most significant conclusion we can make based on this data?

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Viral Replication

The virus is acellular and considered non-living outside the host cell. The replication of the virus occurs only inside the living cells. Only a few genes are present in the smallest virus, whereas many genes are present in the largest virus. These genes encode specific viral proteins.