When you look through a sheer curtain at a distant street lamp, you see a pattern of colored spots of light. This occurs by

The united states constitution gives the the power to regulate interstate commerce.

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.

"there will be differences in degree of mood elevation seen in depressed clients after receiving either cognitive-behavioral or psychoanalytic therapy."; in this hypothesis, mood elevation is the: