Choose all that apply. two things societies with iron technology developed socially are less of a need for social classes divisions of labor hierarchical social classes iron lungs

The right answer for this question is "hierarchical social classes and divisions of labor”, principally presented during the Industrial Revolution. Hierarchical social classes refer to a division of the society based on the differences of income and richness of the individuals. Divisions of labor is the number of different jobs in which the work needed is divided for the production of a good or service, jobs that have to be done by specified workers in that area.

answer; i believe that the correct answer is (decreased)

answer; researchers typically cannot control people's sexual behaviors as would be necessary in an experiment;