Please please help me I really don't know and I need help. The question is about the law.

Why is the supremacy clause considered to be the root of federalism?

"magic" mushrooms have effects similar to those of a. lsd b. pcp c. ketamine d. none of the above

Which of the following powers is held only by the federal government? a. power to make a treaty b. power to set marriage laws c.power to create driving laws d.power to set the legal drinking age