Are polar climates cold all year round with little to no vegetation

Which of the following was an economic reason for the united states to declare war on spain in 1898?

Which of the following policies can the government use to encourage entrepreneurship?

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.