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Which of the following is a term for a variable that researchers do not control and that can affect the results of a study?

Why do you think that the Romans could unify their peninsula and the Greeks could not?

Explain why a government might use rationing and what some effects of rationing could be. (ECON)

A country has an increasing birth rate and a long life expectancy. What shape would its population pyramid resemble? A wider-based triangle An oval An upside-down triangle A narrow triangle A rectangle

Based on the graph, how is coal consumption likely to affect future generations? A. The higher our current rate of consumption, the less coal will be available in the future. B.

What is local diversity

Describe the agricultural systems associated with major bioclimatic zones

Caleb makes 70% of his free throws and is shooting free throws after practice. What is the probability that a) He makes the first free throw he shoots. b) He does not make a free throw until his 3rd attempt.

Which of the following underlying issues significantly increased the effects of the Hurricane Katrina catastrophe in New Orleans?

If a technologically advanced civilization in a nearby star system transmitted messages intended for us, how long would it take for the messages to reach us? A) a few minutes B) a few days C) several months D) several years