a group of randomly selected subjects for a study that matches the population on important characteristics such as age, gender, etc., is called .

What’s the reason for not digging up aztec ruins in modern mexico city

Which of the following is a major difference between appellate courts and courts of first instance? a. appellate courts do not use a jury, only judges.courts of first instance hold appellate jurisdiction exclusively.c. courts of first instance do not use judges and appellate courts do.d. appellate courts hear all criminal and civil cases and courts of first instance do not.

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?