Compare and contrast the census 1970 and census 2020 and explain how this exercise shows that the concepts of race, ethnicity, and even gender change over time

What is the difference between the kurds and the shia muslims? a the kurds are a religious group while the shia muslims are an ethnic group. b the kurds and the shia muslims are religious groups. c the kurds are an ethnic group and the shia muslims are a religious group. d the kurds and the shia muslims are ethnic groups.

6) why do you think the battle of concord was important of the patriot soldiers?

This is for my social studies guide and i can answer 21/22 of it perfectly fine. but can someone tell me what the caste system was, and what divisions/classes that it was apart of it?