From most to least, which shows the correct ranking of regions by number of immigrants to the united states? 1st: europe 2nd: asia 3rd: north and south america 4th: africa 1st: north and south america 2nd: europe 3rd: africa 4th: asia 1st: africa 2nd: asia 3rd: north and south america 4th: europe 1st: europe 2nd: north and south america 3rd: asia 4th: africafrom most to least, which shows the correct ranking of regions by number of immigrants to the united states?

Scientist: cross-sections of stalactites—calcite formations deposited on cave ceilings by seeping water—can reveal annual variations in rainfall in particular areas over hundreds and thousands of years. we often found that when—according to these cross-sections—drought occurred in a particular area, it coincided with the collapse of an ancient society in that area. i hypothesize that drought reduced agricultural productivity in these areas, thereby leaving these societies without the resources needed to handle internal stresses and external threats. which of the following, if true, would most weaken the support for the scientist's hypothesis? a. many droughts indicated in the cross-sections of stalactites do not correspond with the collapse of a society in that area. b. information from the cross-sections of stalactites alone cannot reveal the level of agricultural output in an area at a particular time. c. most of the societies that collapsed during droughts did so when internal power struggles coincided with military raids from neighboring societies. d. most of the societies that collapsed during droughts maintained large stockpiles of food and water at the time of their collapse. e. information from stalactites also suggests that the collapse of some societies coincided with periods of abnormally high rainfall.