What is the minimum number of supreme court justices that have served at any one time?

What was the social class pyramid during the civil war?

The most effective way to provide children with safety messages is to

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.