The phylogenetic tree at right with the root at the left represents the current best understanding of relationships among the

Question

The phylogenetic tree at right with the root at the left represents the current best understanding of relationships among the human immunodeficiency viruses HIV that cause AIDS and simian immunodeficiency viruses SIV in other primates HIV includes two major groups of viruses HIV 1 the cause of the AIDS epidemic and HIV 2 each of which includes several groups or subtypes The primate hosts of each viral strain are indicated Which of the following statements is best supported by this phylogeny HIV 1 human HIV 1 human SIV chimpanzee SIV chimpanzee SIV chimpanzee HIV 1 human HIV I human SIV chimpanzee SIV L Hoest s monkey SIV sun tailed monkey SIV mandrill SIV vervet monkey SIV grivet monkey SIV tantalus monkey HIV 2 human HIV 2 human Low SIV sooty mangabey SIV sooty mangabey SIV Sykes s monkey O a HIV 1 in humans was derived at least twice from SIV in chimanzees O b HIV 1 and HIV 2 evolved from one common ancestral virus strain that was acquired by humans from one species of monkey c The HIV viruses are more closely related to each other than to the SIV viruses

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