What type of style did leonardo da vinci use to paint mona lisa?

Which is not an abundant natural resource found in africa?

During the era of european expansion, what was the biggest reason for spain’s push for exploration?

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.