In which state can you visit joshua tree national park?

The physical feature that makes up part of the border between canada and the united states is the

How do direct democracry and representative democary differ

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.