GCSE Chemistry module: Periodic Table By the end of this topic you will have covered: - Development of the Periodic Table - Atomic structure and the Periodic Table - Group 1 Alkali Metals - Group 7 Halogens - Transition Elements - Group 0 Noble Gases GCSE revision videos and apps from LearnersCloud: http://www.learnerscloud.com/student/products/gcse-chemistry To find out more and to start a free trial visit: http://www.learnerscloud.com/student/home/gcse/gcse-revision
Basicly there were two different levels with sublevels in them to further categorize people in the Aztec social system. The commoners were called macehualli. They mostly worked on lands. Once time passed farming got more advanced so there was no need for many farmers.