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In page Miocene:

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Life during the Miocene Epoch was mostly supported by the two newly formed biomes, kelp forests and grasslands[citation needed]. Grasslands allow for more grazers, such as horses, rhinoceroses, and hippos. Ninety-five percent of modern plants existed by the end of this epoch[citation needed]. Modern bony fish genera were established.[1] A modern-style latitudinal biodiversity gradient appeared ~15 Ma.[2]