Name the 2 group needed to have a valid experiment

In which of these countries was the western front located during World War I? Check all that apply.

Explain the type of economic system found in North Korea. Who controls the economic activity? What program receives the majority of the country's budget?

Which excerpt is a counterclaim in "What to the Slave is the Fourth of July?" What is this but the acknowledgment that the slave is a moral, intellectual, and responsible being? The manhood of the slave is conceded.

British researchers randomly assigned 424 hospitalized premature infants either to formula feeding or to breast-milk feeding.

A system that distributes power between state and national governments is called

Joe cool went to a baseball game and got very hungry for a hotdog. while it is true that the ballpark sells soda and hotdogs separately, joe cool never has one without having one of the other.

While state law governs many aspects of the election process, the federal government is responsible for a) registering voters. b) organizing local polling places. c) counting votes. d) passing campaign finance laws.

Evidence that a source is authoritative includes

How did the Maya create a new environment through farming practices?

What Is The Job Of The Senate?