Perceptual constancy enables people to Select one or more: a. realize that retinal images of objects remain the same across viewing distances b. realize that both the upper and lower bars in the Ponzo illusion (Fig. 4.30) have the exact same length c. realize that a person walking away from them is not getting smaller d. perceive a sequence of still images to be continuously moving

world war i had a devastating effect on german-americans and their cultural heritage. up until that point   german-americans, as a group, had been spared much of the discrimination, abuse, rejection, collective mistrust experienced by so many different racial and ethnic groups in the history of the united states. indeed, over the years, they had been viewed as a well integrated and esteemed part of american society. all of this change with the outbreak of war.