Im pretty sure its all of the above!
They are important because without them there would be chaos. Checks and balances is basically checking on the others. The separation is for the three branches(Executive, Legislative, Judiciary) , each have the power to do their own duty; so there would not be just ONE person who takes over.
Answer:
look around you and observe the things you see the trees, flowers, and even clouds in the sky. Describe your surrounding using basic knowledge about the art elements.