In the united states, party identification a. varies significantly by income, race, and gender. b. varies significantly by gender, but not by race. c. does not vary significantly by ideology. d. does not vary by income, race, and gender.

He chart shows the 112th u.s. congress (2011–2012). based on the information in the chart, if the independents in the senate chose to vote with the republicans in the senate, the republicans would

Humans are the only animals capable of communication

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.