According to the reading, how
are the 9/11/01 attacks connected
to afghanistan?

What forms of expression can be restricted by the government

Cost and benefit in economic example

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.