Scientific method is a series of steps that scientists use to answer questions and solve problems.
How does this bridge relate to science?
Well this very bridge is related to science because scientific engineers always have to use science an order to build structures, also engineers don't always have to use math to build structures they could use science too.
What would happen if science wasn't used to build this fair?
Well if science wasn't used to by anyone to build this fair it would be a disaster because not only do you need math to build these structures but you also need science any order to make it successful by using the scientific method.