Explain why the barn owl is considered a keystone species

A keystone species is one that
helps stabilize the populations of the other species in the community
Owls are fascinating creatures. They are beautiful birds with big eyes that make iconic hooting sounds, but they are, above all, incredible hunters. Because of this they have large impacts on the ecosystems in which they live, but their position near the top of the food chain makes them sensitive to changes that occur within i

Ibelieve the answer is relative humidity  because it makes more sense that way. solar flares usually occur in space it doesn't affect the earth, well it could but it wont make a significant damage.  latitude is land it doesnt do anything. prevailing winds, i dont know the correct meaning for this but i doubt that affects the land so it has to be relative humidity.