Which method best helps to prevent wind erosion? rotating crops, decreasing riverbank slopes, more animal grazing, avoid soil compaction

What form of government did argos have

How did anti-semitism propaganda, such as posters, radio programs, and movies, impact germany? (choose 2) question 8 options: it caused german citizens to become sympathetic to jews. it led to riots and destruction of jewish shops, homes, and synagogues. it led german citizens to protest against adolf hitler and the nazi party. it turned german citizens against jews.

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?