Monroe doctrine say about isolation

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.

Which are components pf a political party? why do we need political parties give reason.

This is a crossword assignment for psychology 8 letter word a benefit of observational research is that it often generates