Fossils can tell us where countries were because say there's T-Rex fossils in Canada and there's also some in Russia that means at some point they were connected
They can tell us how life has changed because if the size of the bones compared to the size of humans bones. It shows that life use to be much different back then
You want a big base to support the building from falling. You want the building to be flexible so it can sway and flex during the earthquake, if it's to strong it will snap