The evolutionary tree of HIV-1 revels that    a.) The SIV strain that infects gorillas is the same strain that infects chimpanzees.            b.) HIV is a monophyletic clade that originated from the same strain of SIV.            c.) All of the answers are correct            d.) The virus jumped from chimpanzees to humans four times.            E.) western chimpanzees are more closely related to gorillas than eastern chimpanzees.

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