D

Figure 1. Cladogram indicating the predominant patterns of social organization in strepsirrhine primates, "primitive" placentals (insectivores, elephant shrews, tree shrews, and colugos), "primitive" marsupials (dasyurids and didelphids), and monotremes. P = Promiscuity; MF = Multimale/Multifemale system; Mo = Monogamy; ? = unknown. Data from the literature are in white boxes, possible ancestral patterns are in black boxes. Animal groups that exhibit social networks are underlain with gray. (Adapted from Müller and Thalmann, 2000.)

of these two systems is most likely to represent the ancestral condition for the order Primates, therefore, remains unresolved.

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