The figure below shows a phylogenetic tree of immunodeficiency viruses.Suppose biologists had all of the information shown but did not have samples from sooty mangabeys.Under these conditions,what would you infer as the most likely source of HIV-2? 
Definitions:
MC = MR
A condition where marginal cost equals marginal revenue, often used to determine the profit-maximizing level of output in economic theory.
Monopolistically Competitive Industry
A market structure in which many firms sell products that are similar but not identical, allowing for competition based on quality, price, and marketing.
Output
The quantity of goods or services produced within a given time period.
Profit-Maximizing Rule
The principle that firms maximize profit by producing at the level where marginal revenue equals marginal cost.
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