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WHAT IS POVERTY ?

Which statement is a good description of a model? a) models are a description of nature based only on one or two variables. b) models are testable ideas but they are not very to most people. c) models are a description of nature that predicts more accurately than real events. d) models are an approximiation of a real system that omits all but most essential variables in a system.

What are the most populous and least populous areas of russia? and why are some areas more heavily populated than others?

What is one property that water and oil do not share