An event that will most likely change the dominant plants in an ecosystem from large trees to grasses is overgrazing by herbivores.
An Ecosystem may be defined as the place where a number of species are lived and interacts with one another for the purpose of food, shelter, and space.
Overgrazing by herbivores leads to change in the ecosystem through the modification of large trees into grasses. Excessive overgrazing leads to soil erosion, an increase in toxic plants, etc.
Therefore, an event that will most likely change the dominant plants in an ecosystem from large trees to grasses is overgrazing by herbivores.
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