How Do Keystone Species Have The Biggest Impact On High-Degree Diversity

I think that keystone species have the biggest impact on the high degree diversity that we see within ecosystems because it Controls the herbivores. Which creates and changes many different things.
One reason that keystone species have the biggest impact on the high degree diversity is that keystone species can control the amount of herbivores which can create different plants like in the video “Some Animals Are More Equal than Others: Keystone Species and Trophic Cascades” In the video it talks about how the places without sea otters have no kelp in them because in places without sea otters there is a problem with an over population of sea urchins, From this there is little to no kelp. So, this means that if there are sea otters than there is kelp. Overall this means that keystone species create high degree diversity.
An example of this is when the wolves were taken out of Yellowstone Park, when this happened the park became deprived of plants. When they were put in the plants became grown and diverse. This happened because the wolves changed the behaviors of its prey and this make it so that the plants were able to grow back. This was all created by keystone species. Overall keystone species have the biggest impact on the high