Refer to the diagram below showing a phylogenetic tree of immunodeficiency viruses. 
Based on the information in the figure, can we infer whether HIV-1 or HIV-2 moved into humans first? Explain.
Definitions:
Trees
Perennial plants with an elongated stem, or trunk, supporting branches and leaves, typically living for many years.
Offspring
The product(s) of reproduction, representing the next generation of organisms, which can be either asexually or sexually produced.
Metapopulation
A group of spatially separated populations of the same species which interact at some level.
Recolonization
The action or process of resettling or reestablishing control over a previously colonized area.
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