The population of the United States is approximately.
A.900 million
B.300 million
C.500 million
D.1.3 billion

"spheres" is the name of the four subsytem

Computer models can scientists predict weather. some computer models can show the predicted path of hurricanes. what other events could a computer model warn us of? a) undersea earthquakes , tornadoes, and avalanches b) tornadoes c) avalanches d) undersea earthquakes

Modern democracies function as republics in which elected officials make decisions for the majority of the people.