Which statement best describes the Louisiana Purchase? It helped to clarify the borders of the United States.
It allowed the United States to acquire Florida.
It made the United States twice as big as it had been.
It gave the US government control of the Great Lakes.

c

Explanation:

It made the United States twice as big as it had been.

answer; researchers typically cannot control people's sexual behaviors as would be necessary in an experiment;

conformal maps greatly distort _sizes_ of continents in higher latitudes.

the answer is sizes.