The diversification of grasses has occurred mostly in the last 20 million years. Some scientists have argued that this can be explained by a decline in the concentration of carbon dioxide in the atmosphere.
Most of the Earth's surface is covered by grassland biomes, which currently account for up to one-third of net primary production on land. Grasses make up the majority of grassland biomass and plant populations, but other plant groups, especially the Daisy family, are usually as diverse as grasses.
A new landscape was created when grasslands emerged, and grazing mammals like horses, wombats, and capybaras were among the various life forms that co-evolved with this biome and benefited from the substrate that grasses supplied.
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