What might be the cause of the shift from the Miocene,which had greater diversity of ape species and fewer monkey species,to a living assemblage with greater diversity of monkey species and fewer ape species?

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The shift from a greater diversity of ape species in the Miocene to a present-day assemblage with greater diversity of monkey species can be attributed to differences in the ability of these primates to exploit the habitats that emerged following changes in global climate. Monkeys, with their more adaptable diets and locomotion, were better suited to the new environments than apes, leading to their increased diversity.

What Might Be the Cause of the Shift from the Miocene,which