are thoughts, images, ideas, or impulses that are persistent, that uncontrollably intrude upon consciousness, and that cause significant anxiety or distress.

"social stratification refers to the way people are ranked and ordered in society. in western societies, stratification is primarily seen and understood as a result of socioeconomic status, which produces a hierarchy in which access to resources, and possession of them, increases from the lower to the upper strata"

answer; first blank(1); 30% two(2); salmonella; i believe this is correct; //good luck;

probably 3 since archeologists and historians don’t understand there writing.