The diversification of grasses has mostly occurred in the last 20 million years. Some scientists have argued that this can be explained by

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The diversification of grasses in the last 20 million years is largely attributed to a decline in the concentration of carbon dioxide in the atmosphere. Lower CO2 levels can favor C4 photosynthesis, which is more efficient under such conditions and is a common pathway in many grass species. This adaptation allowed grasses to thrive and diversify in environments where other plants might struggle.

The Diversification of Grasses Has Mostly Occurred in the Last