[Solved] If the economy is in macroeconomic equilibrium with a vertical AS curve,and then aggregate demand decreases,we expect the AE function to shift to a A)higher level and stay there. B)higher level,but then shift part of the way down to its original position as the price level falls. C)higher level but then return to its original position as the price level falls. D)lower level and stay there. E)lower level,but then return to its original position as the price level falls. Visible Structure: The physical or organizational form of something as it appears to the naked eye. Organism's: Refers to any individual living entity, from single-celled microorganisms to plants and animals, including humans. Observable Characteristics: Traits or features that can be seen or measured directly. Phenotype: The set of observable characteristics of an individual resulting from the interaction of its genotype with the environment.