Help me answer the questions!

Which statement best describes a contribution of the works of nicolas copernicus and galileo galilei?

The internal combustion engine was an innovation of

Why might collective bargaining fail, causing a union to go on strike? a the union agrees with the boss about wages. b the boss compromises about work hours. c the factory goes out of business, causing the workers to lose their jobs. d the boss refuses to address dangerous working conditions in the factories.